Many people are really bad at detecting AI at that level. And gamers get vengeful. The review process you propose would be immediately overloaded.

I released a game on steam 100% human made and still got a few accusations of using AI in reviews. Who knows how those reviews have hurt sales.

Next time I make a game I'm going to use AI in a way that helps me realize my own vision. It's really not worth keeping a line in the sand anymore since enough people can't actually tell the difference.