That "trope" is in almost every press release, every corporate announcement I have read in decades.

AI is trained on all that material and regurgitates it. It is trained to do that.

So the problem we have is that AI sounds like that, because humans sound like that. The "identifier" you've found isn't real. It just shows - if an LLM did this - that it's working, and that corporate speak is ubiquitous.

And the lists of threes, man, that's just basic English composition I was taught when I was 8 years old - it's everywhere. It has, to a native English-speaking ear, a rhythm, cadence and elegance. See?