If someone makes 20 posts and most of them are labelled as "likely AI" by multiple detection tools and generally sound like vague bullshit, then... you know... it's a duck.
I can agree on that, but considering that the majority will say that any free work is a waste of time, I wonder who will spend their time hunting this new generation of AI posters if we also take into account the attitude of the moderators towards such reports. It seems to me that the majority of such reports could remain unhandled.
Just like with any other issue, e.g. plagiarism - you don't rely on a tool 100%, you need to look into the context of how this occurred, what the potential intent was, etc.
Actually, I always rely on some tool that can detect plagiarism, and that tool gives me possible sources that I then check and try to determine if someone has plagiarized their post, whether it is perhaps that someone is the original author and forgot to post the source. I always approach such matters very seriously, and even if I make a mistake, I know that the moderators will not make their decision hastily.