The Forum doesn't permit or encourage the use of AI in posting
The forum doesn't have any specific rules on the use of AI bots, but it does have rules on plagiarism. If the admins deem that you have plagiarized, then you are in trouble regardless of whether you used an AI or took the content from elsewhere.
If you don't know, just know that using AI is against the rules and regulations of this Forum and if caught (especially when you're in a campaign) your account won't be of any use to you.
Again, the forum rules don't discuss AI posting in any way because they were written long before AI technology was introduced. You are right about the second part of your sentence. Some signature campaign managers have rules that prohibit the use of AI software. If users are found to be using them, they will get rejected from the campaign and perhaps DT members might give them negative feedback.
But this isn't in any way connected to forum rules. We need to make a distinction between what the forum allows/disallows and what isn't encouraged by the community.
For instance, scamming someone isn't against forum rules, and you won't get banned for it. But such actions can earn you negative feedback by forum users.