I think the key tell is that the writing doesn't actually illuminate anything worth learning. The more I see of AI produced output, the more I believe that there is nothing there that wasn't already in the prompt. It's an inflation of a single idea to pages of text. It meandors about and never actually gets into detail.

It's a lot like talking to someone who doesn't know what they are talking about but are good at faking it for a while. The game works by leaning on pat phrases, circular reasoning, and hoping nobody is paying too close of attention. I think this is why it's so popular with the corporate executive class, as that has been their mode of communicating their entire careers. To them, they don't see anything wrong.

"Shitty writing existed before AI" is unfortunately an all too common rejoinder to this issue. That's not an excuse. That doesn't make it better. Just because the pointy haired boss talks that way doesn't mean we should be gleefully pouring gasoline on the fire.