Ahh, the Superman who showed up, smiled and gets neverending props for doing so.
Superman Prime isn't god, nor anything close to it.
His status on messageboards is all based on hyperbole and forumlore.
The one thing we know he can do is give out indestructabe flowers.
The Dark Phoenix splinter might be able to be quelled, but thats not exactly the true phoenix force.
I can't see him registering even so much as a beep on its radar.