No forum should allow AI-generated content if there are active posters on the forum, there's a probability that the AI content could beat the post quality of posters, this is a community discussion platform and it should all be human-generated responses subject to errors and correction, that makes a forum great.
It's not good to see an AI-dominated community because it will become a battle of who's the better AI to come with a perfect answer, our visitors are human so the forum behavior should be human-related and not generic AI.