Your story doesn't make sense to me because an admin or a mod doesn't identify the plagiarism or AI-generated content on their own or using any tools, it's identified by the community and reported via the report to mod button or in the dedicated threads.

You are lucky that you got away with only a post deletion.

But what you made it clear that you cheated in the campaign to create posts that were paid using an AI tool, IMO the manager can tag you for that if he feels that comes under cheating.