I can understand it perfectly fine as a theoretical.
There's just no evidence Aspinall HAS done this, against ANY level of opponent, as he hasn't had to display it since because he instead wins by KO on the feet when everybody stands with him even when they're wrestlers like Blaydes. So no I'm not going to pretend he's now some super duper master at anything he hasn't displayed before just because he possibly could be. He also possibly could be just as bad.
Hypothetically he's better off his back than when a can like Stuart Austin could hold him down for 8 minutes before subbing him. But that's a pretty low bar, and we're also talking about hypothetically being able to survive under someone like Brock who's top game is absolutely not regional can level.