Certainly keep humans in the loop. Have you seen Robocop? Seriously, there’s a lot of judgement in moderation. While it’s good to have guidelines, and to use them, running them as a set of strict rules seems to me foolish - a technical solution to a human problem.
Edit: I would add, I run human-scale forums, where the moderators know each other and know the regularly contributing members. I’m sure OpenAI are thinking of industrial-scale forums, run for profit, where the moderation challenges are quite different.