I agree, I think this is AI, especially based on 1 and 2. It's hard to put your finger on, and I don't know if we can know for sure. It reminds me of the writing style you see on LinkedIn i.e. seemingly optimised for engagement.
If they're not already, I wonder if LLMs will get better at disguising this (avoiding the tells, inserting mistakes etc.)
I also wonder if there comes a point where we as a culture imitate this style.
Perhaps consider a public domain film for the demo?
https://en.wikipedia.org/wiki/List_of_films_in_the_public_do...