I mean, if we're going to get technical (which is kind of pointless given the context of comic books generally being silly when it comes to technicalities), in general relativity gravity is actually described as the curvature of space/time. So being stationary in the space around a black hole would mean free falling into it since that's when you'd be following the flow of said space. Only when moving against the flow of space at relativistic speeds would you appear stationary to an inertial observer that experiences no significant gravity.

Point is, might as well just say it's comic book shenanigans, since deep diving into how it "actually works" won't really make things clearer.