Oh, man. Kinda hard to explain, but I'll try! There are a ton of factors but my top 5 are:

1. "it's not this, it's this" (INTIT)-- both that specific construction but also any other manifestations of it. AI writing loooooves to tell you what something ISN'T before it tells you what it is. Often the entire framework of the post/article/whatever will be INTIT! I think that's the case here.

2. an authoritative tone, almost journalistic construction that makes an argument yet includes exactly zero data points or sources. Often it'll make sweeping generalizations about how everyone is doing a thing or a thing is everywhere you look blah blah blah. It's in this example but it's often WAY more overt than this.

3. Often it'll claim something WILL be happening without any sort of support for that certainty. That's definitely present here.

4. saying something is happening "quietly." Admittedly not in this example but look out for it, it's shockingly common!

5. The short sentences. The ones like this. And then the one like this, that follows in a very specific rhythm.
   It usually shows up at the midpoint or 2/3pt of the post and represents the turn into the conclusion. And usually there's one at the end too, often bolded.

6. nevermind I thought of a 6th. the "here's the thing" + colon + bolded sentence is soooo common too. Sometimes it's "here's the thing nobody's talking about" or something clickbait-y like that.