I haven't seen the movie, but Deadpool the comic character pretty much exists to critique superhero comics. There's the fourth wall breaking, usually about the medium or the comics industry. His violence is presented as wacky slapstick, and you accept it that way because comics, and then something emphases how unfunny violence really is. He gets different, mutually contradictory, traumatic backstories every other writer, and all of them are true. And so on. That's what he's there for. I don't think it says much beyond that's what they had to work with.
Absolutely. But take that essential principle of the comic, do that, and then double-down on doing it again to movies. And you wind up with something so meta that you are not sure if you are actually having a real experience, or just unknowingly participating in some incomprehensibly layered and self-referential art project. When you see the movie, you will LOVE the opening credits, BTW.