I'm in favour of banning ChatGPT from Superuser (and many other StackExchange) forum, but please refrain from being too harsh:
Recently, I was doing reviews, I agreed on a "First Answer", but apparently that answer was auto-generated by ChatGPT, so my evaluation was wrong.
No problem there, but this question seems to be used as a review test, and that goes too far: review tests can contain rubbish, spam, insults, ..., but a Superuser post, containing correct information, using as a review test because the author is (believed to be) a computer and not a human being (which will become more and more difficult), that's a bridge too far and will only reduce the amount of reviewers on this site.
Hence, I do agree deleting ChatGPT post from this site.
I do not agree using such posts a review tests.
In case somebody says "This is not an answer on the question whether or not to ban ChatGPT from the site", my reaction is "It is my way to agree to the statement and to add information on how to proceed while doing that".