Lot's of AI generated assets and content around the game he actually built.

"Procedurally generated" games are literally indistinguishable from AI created games in the end result, they just became commonplace before the "AI craze" took off and it became trendy to call it that. It might actually be the same thing, but I don't know enough about the software to be certain.

And that works pretty well for a lot of games, because the foundation and loop is already built for them and the engine just creates the world around it. For example, Hades probably wouldn't be able to have an absurd amount of spoken dialogue if they had to manually build every single possible room path and its variables.

But if anyone has played a bad procedurally generated game, you already know the faults. The quickly apparent re-used assets, the lack of originality or soul in their use, and the ability for purely dud runs because the AI either used computer perfect play to get through or just generated an impossible set up.

And that's just on games where its used for level design after a human created most everything else for it. Giving the AI full control of everything will only make those problems more pronounced or create more like them.