What carrot said.
You need this tag:
https://itch.io/games/tag-ai-generated-graphics
The general ai tag means any combination of
https://itch.io/games/tag-ai-generated-graphics this has 13k entries
https://itch.io/games/tag-ai-generated-audio
https://itch.io/games/tag-ai-generated-text
https://itch.io/games/tag-ai-generated-code
Especially the lumping together of code with art is problematic, as people usually only care for ai assets, when they filter against ai. Or for ai, in your case.
The catch it all https://itch.io/games/tag-ai-generated has 26k entries.
Oh, and if you see the tag no-ai in the info box, that is a manual tag. You do not see the meta info tags, but can filter for them. Weird solution, that needs improvement. Also, as far as I know, it is only mandatory for assets to give that information.