That is terrible advice. And apart from violation of Itch guidelines might be grounds for legal action of customers. The reason for mandatory ai disclosure for assets are of a legal nature.
AI disclosure was requested before this new feature, in the quality guidelines: https://itch.io/docs/creators/quality-guidelines#avoid-uploading-excessive-amoun...
Please ensure that your content brings something new and valuable to the community. If your project involves automatic or AI generation, make sure it’s clearly stated in your project description and that it adds substantial value to the user experience.
The tagging feature just formalizes the method you can desribe your content having gen ai.
What I see critical is the usage for game filtering. For assets it is clear. Any AI usage has to be known and filtering is a big help. But for games there is a fundamental difference if the content is gen ai based or if only code is gen ai based.
So I would prefer to see a no-ai-content tag. Gen ai code is not content. It is not story, it is not assets. The few people that hate AI with a vegan mindset should have their no-ai thingy, but it is not helpful for people that just want to support human made art. Code is not art in this context, but non developers might not grasp this at first sight.