https://itch.io/t/4309690/generative-ai-disclosure-tagging
This field is now required for all asset creators on itch.io. ... We’ll have a grace period for people to update their pages
You missed how this is only mandatory for assets.
Also, those are not tags to see, but tags to filter. This means you will not see the AI tags in the info box. It is a very bad implementation of that feature. Terrible design. Making the info a tag, but not a tag.
It is very confusing. Therefore I will explain in detail:
Every tag you see in a info box ("More information") on a project's page is manually added by the developer.
Tags are things in the tags list and in the genre list. Itch has freestyle tagging, so people can chose to use basically any tag, even https://itch.io/games/tag-unity , despite there being https://itch.io/games/made-with-unity meta information.
Same goes for any ai tags. They are meta information, but this type of meta information is not displayed on the game page's info box. But it can be filtered by the tag system and two of the new tags appear in the tag filter drop down list. Did I mention how terrible a design that is?
You cannot directly check, if a game has the new meta information. You will have to use ai-generated and the tags of the game to see if it appears in the results or not. If it does not appear in ai-generated nor in the negation tag no-ai, the ai disclosure was not answered. If you see any of those tags in the more information box, it was used manually by the developer as one of the 10 tags.