For assets
https://itch.freezing.top/game-assets/tag-no-ai
For games, ai tagging is not required, so the various ai tags will be not be accurate - like all tags. Especially for older games.
But I think disclosure of ai was in the guidelines before all that new gen ai tagging. "If your project involves automatic or AI generation, make sure it’s clearly stated in your project description". But there is much confusion about terminology. Maybe it meant live gen ai and not ai generated assets.
I would wish the formal disclosure to be a bit more elaborate then a yes/no filter. Or visibility of a yes/no tag.