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.
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The writing style can be quite varied.
See this example:

I don't know what happens if we feed the AI with LoyceV post, but I guess the AI could imitate his writing style, language nuances, lateral humor etc.