Gorr's Planet
Here's a couple images to establish what Gorr's planet looks like when on it. You'll note the atmosphere, usually a yellowish desert tone. Even when it's "night" out, you can still see it in a slightly different tone. Also note the rocky ground that rises up with crags and the like.
https://imgur.com/a/q4CUI
In those pictures, that big sphere is the moon sized Gorr bomb. So, with the information we have, I will point out important details about Gorr's planet
So, with that in mind, we'll speak of the "planet" you think is Gorr's planet. You'll notice how you can literally see the roundness of it when they're fighting on it. You will notice no crags, or formations, no atmosphere. But we also have a comparison of it compared to Thor and Gorr. It is not very big, nor is it ever portrayed big.
What this means is that the planet was not Gorr's planet. However, admittedly in Gorr's solar system.
The Moon
Your argument is that they were on Gorr's planet, and the cracking moon was the one Gorr got blasted into. So we'll look at the scene.
https://imgur.com/II01eBu
https://imgur.com/5MgP8Ms
https://imgur.com/IO16Fps
So, Gorr's planet was established as at least 2 lightyears away if not more from that moon.
Which is why Gorr made a black hole to bring his serpent in from around his planet, to that moon:
https://imgur.com/XU8Lnuw
https://imgur.com/91QaTT9
https://imgur.com/Uitonsu
The wormhole was still up when King Thor killed the Serpent
https://imgur.com/qXDbRyS
So basically, Gorr felt he needed to create a wormhole to bring his serpent in quick, because it was light years away. This is downplayed severely if this is the same moon, and this is Gorr's planet. This is what your argument is:
And if that were the same moon, and we switch the argument to not be Gorr's planet, and instead a tiny moon, it means that Gorr created a worm hole to get to that distance we see in the scan. Which makes even less sense because that would mean the Serpent flew light years and then created a worm hole to cross at max the distance from Earth to Mars? There's no way he made a wormhole from world to world in that fight.
Which, keep in mind, 2 light years is about half the distance to the next closest star in real life. That is portrayed a little bit further than Thor was from that moon to say the least. However, the implication was that it was even more than 2 light years, and the wormhole brought them to another solar system.
However, to put light years into perspective, we have this (2 light years is beyond our entire solar system)
https://commons.wikimedia.org/wiki/File😛IA17046_-_Voyager_1_Goes_Interstellar.jpg
https://www.calculateme.com/Astronomy/LightYears/ToAstronomicalUnits.htm
Which means that you're arguing that Gorr's planet was at least 126,482 AUs away from the Moon. That is 126,482 distances of our planet to the sun. And you think it was just meant to represent the line of sight Thor saw? Pluto to the sun is on an average of 40 AU for example.
However, we will look at the differences as well. We have this nice teal planet, that even looks that color when we get a close up of Gorr's face. The only times it doesn't it when the surface is broken through. We see no actual features to the moon. There's a little more pictures of the moon, but it shows the same thing. We also see where Gorr landed, which was a large divot in the moon. This moon was pretty consistent. Even the two panels I'm excluded show it being the same color.
https://imgur.com/3CNpRQB
And now, we get the "moon" Thor went to repair.
https://imgur.com/ZrRbMc9
https://imgur.com/yc64Xpj
https://imgur.com/pdhyfIt
First off, it's not even the same color. Second, it actually has features, along with an atmosphere, and it's habitable. Third, it's not even the same color.
There could be an argument made that it's supposed to be an actual planet, as the narration calls it so, and Thor just wasn't paying attention, but it doesn't matter. This was not the same moon on every level.
The Black Hole
This one is straight assumption territory, but considering we know the little planetoid Thor landed on when he went through the black hole wasn't Gorr's world, we can make a safe assumption here.
This is all we were shown of where it came from. We know it came from Gorr's world, but we never actually see it opening up a black hole from Gorr's world. See, no black hole
So, we just assume it made the black hole a little further out by some planetoid moon. It's really that simple, because that's what happened. Though, it was in Gorr's solar system since they never went back through the black hole again, and like you said, went through the sun and landed on Gorr's world. That doesn't mean it came from Gorr's world however. Even if it did though, it wouldn't have been the same "moon", so it actually being Gorr's world directly rules it out from being the same moon immediately.
Though I am unsure of how landing on Gorr's world proves anything. I already said it was in the same solar system. Plus you don't just land in the sun and get blown to a planet. Which means Gorr's the one who did additional tinkering anyway.
So what we gather from this is that Thor was at the very least damaging that "moon" and it wasn't OKT that caused the damage since it wasn't the same moon. It's also very likely he destroyed that planetoid, especially since we saw it blasting apart, and Young Thor riding on chunks after. Which I'm not saying is a great feat, just something that likely happened. It did say worlds were shattered, but I'm not too interested in that. But it did say it nonetheless.
I'm not going to debate this further because you cannot in any way be correct. There is so much conflict to get to where you got, and the fact that you think that little planetoid is Gorr's world, and the moon is the one OKT blasted him into - which was at the very least 2 light years away - is just too much.
Should have told me to piss off, I would have. Now I'm going to piss off with this post, something that none of these Thorhomos would have even tried to explain. Which I probably shouldn't have even tried to explain either, but I am mildly curious as to your reaction. I predict either an lol smile or you debate this line by line.