Using AI-generated content is not much different from plagiarism and I believe it is against forum rules. If this AI-generated content abuse becomes bigger, the forum rules topic will be updated with new guide about AI-generated content.
I'm not supporting AI, but I still stand using AI isn't against forum rules except you can bring the proof where the moderator said using AI will get banned.
I think AI usage is already big,
AI Spam Report Reference Thread created since June 16 and now there are 13 pages, while
Report plagiarism (copy/paste) here. Mods: please give temp or permban as needed post from June 16 - now only contain 9 pages (156-164), so it means AI usage surpassed plagiarized content.
Your example aren't appropriate, he's a newbie and can't join signature campaign, while you're discuss about signature campaign.