If this truly set off zero flags for you then you're probably just not very attuned to LLM writing style. I've noticed that most people are not.

I posted a bunch of specifics in a reply to the GP since I was quite annoyed with being accused of "a lazy way of dismissing stuff". It's nothing of the sort. I am a very good reader and I have read a lot of LLM writing and a lot of human writing.