OP didn't  show the username but showed the id
OP's Suspect=> Princeeibn

Generally I think once a post uses a chat bot to generate a reply  for a post or let's just say Ai generated text as you've  said , there's no how it won't plagiarise because it uses available  resources to answer your question  and that's gonna plagiarise someone's content nmw. Now detecting it sometimes could be tricky.... because you see some similar word  expressions in a post doesn't really means it's AI generated though  the user above could  have  used an Ai for his/her  content.
Thus even if the rules are created, the content still needs to be reported and the  decisions will still have to be carried out by mod.