Absolute nonsense.
Omni-Man outlier in a crossover comic, where Supreme is being dumbed down for Omni-Man to have some success, does not negate all of his limitations from the Invincible series.
Also LOL @ calling Supreme in that fight the most powerful and most bloodlusted Supreme. During Supremes fight against Gladiator, Supreme was willing to destroy planets and kill innocents to take down Gladiator. That's actual bloodlust. They were still evenly matched and Gladiator knew that the fight could go on for years.
Does anyone here think that Omni-Man can withstand a planet shattering onslaught for years? LOL!
The fact still remains: Viltrumites die upon colliding with planets, burn as soon as they even touch the sky and need days up to months to regenerate lethal damage.
Hercules = high herald in the strength and durability department / mid herald overall.
Thragg and Invincible = low heralds at the very best.
I'm not saying that low heralds can't beat one-dimensional high heralds, but given how one-dimensional Viltrumites are as well and how big the difference in strength and durability is between those characters... Yeah, they aren't beating Hercules. Period.