That’s exactly it, he knows what it means - all. L5 is easy like that.

He’s delusional thinking that he could ever actually achieve that, but that’s why L5 is so much simpler of a concept than L4, as with L4 you can argue about semantics and details about what exactly it has to be able to do to qualify. Level 5 has no exceptions, it has to be completely autonomous with zero human interaction required other than telling it where you want to get to. If it can’t do it, it isn’t L5.