Yes, I know. My problem is that he’s never shown or stated to do so. No one ever states ‘Hey look you made a Black Hole!’, he never creates one first-hand and his only ‘feat’ for it comes from recreating the universe (unless someone somehow says that the previous feat doesn’t break almost every rule in the book). Problem with that is Ben didn’t get everything correct, so we have no idea if he did or didn’t make a Black Hole. And if we don’t know whether he can or can’t create a Black Hole, why would we give him the ability on the profile?
I mean, Ben 10’s Milky Way is very, very different from ours. For example, the One Million, 900 thousand + Alien Species that live in nearby solar systems inside the same galaxy as Ben, and there are at least, like, 5 Solar Systems we clearly don’t have irl. Heck, Pluto was destroyed, Mars used to be populated and there are literal Cobwebs holding entire Solar Systems in place. That’s Science-Fiction for you, after all. In addition, we can see the Milky Way Galaxy during the GG and Alien X fight, as well as other times during the show. I don’t see a Black Hole in there, although that could just be via perspective.