AI makes it easier to shart out complete slop without even having to steal anything. At-least when you're cobbling slop together out of stock images and asset packs you need to actually go out of your way to find things, with AI you just tell it to generate what you want. People are going to submit crappy slop games anyway, but disallowing the use of AI assets at-least raises the minimum effort a little.
If your entire issue is banning the "tasteful" use of AI (drag-dropping stream jokes that just happen to have been made using ai into the game with no modification whatsoever) then this new version of the rule, "None of the original assets made for your submission can be AI-Generated", should be satisfactory.
If you really just want to AI-generate half of the assets in your submission, this isn't the jam for you.