The fact that AI-generated content is so difficult to detect suggests that progress in this field has been extremely rapid. It is remarkable how quickly advances are being made in this space.
I don't think it's do difficult to detect posts like this, especially if they are repeating the same style.
With few simple questions asked in topic or sent in PM I could quickly determine if I am talking with real member or not.
For sure this can happen.
And, as far as I can see from the various example I see around, ti might well already be the case.
If you search for that, you'll see dozen of AI- based services selling AI generated blog posts, Longform, twitter thread and so on.
If this is really the case than we should start reporting posts like that, suspected to be AI generated, in same way we report low quality spam posts.
I would even go as far to temp-ban members who are doing this repeatedly, and full ban can be applied for extreme cases.