I don't think he's using it in the same manner you may be. A game can have random elements and still be "perfect". Because his perfect game may be a game where

I don't think he's using it in the same manner you may be. A game can have random elements and still be "perfect". Because his perfect game may be a game where he can lose due to variance. There is something to seeing if you can play around variance. That way there's always a way the game can be challenging. Unlike games with perfect information and no variance. Those games can be completely solved (given enough resources). And I think that's what you're thinking of, games with perfect information.