@Ant 2 staff also agree, I think it's too early to draw any conclusions, especially after I've said that I still have to respond to Calaca's points. I will however ask Wokistan to comment here as well since he helped out with the original thread.
@Calaca The black holes by Atomic-X show clear
spaghettificatio (of Vilgax's limbs) which is visible near black holes since it is caused by strong tidal forces. It also has the right shape to be a rotational black hole.
The black hole by Alien X also shows spaghettification when Galactic Gladiator gets sucked in (once the black hole is finished and Galactic Gladiator can no longer withstand it's gravitational pull).
It is also the right shape of a rotational black hole and the way that it came into existence (a lot of Alien X's rotating fast and making something very dense) also makes sense for a rotational black hole.
It not pulling in anything else or shown to distort space-time is also not a valid argument against it since there was enough distance for the black hole to not affect surrounding galaxies and distortion of space-time is not always visible as shown on the right pic in the OP + he did actually distort Galactic Gladiator.
There is also evidence of it being non-physical like other black holes (you need non-physical interaction to interact with them) when Galactic Gladiator tried to punch it and not a lot happened.
As cherry on the cake we are shown
Hawking Radiation which is only produced by black holes.
Now if Atomic-X's feat is decided to be black hole creation but not an actual black hole then I am open to a possibly rating since it is likely Alien X has the proper variant of Atomic-X's powers (since he is merely a fusion) and thus can create actual black holes (backed up by him creating the universe), thus it makes more sense to assume what he created is an actual black hole than some weird sealing thingy which was never before shown.