I've deleted a paragraph or two to avoid unilaterally taking everything too off topic, but I'll just say that the book is a self-contradictory artifact of hypocrisy that disrespects the reader.
So, yeah, if your target audience are the people who take those "AI tells" seriously and negatively react to them, definitely craft your writing to that audience. But also, consider if that is really your target audience...
I didn't end up finishing the book.
Myself, I read it at age 12 and bought its premise at the time. Therefore I mentally categorize Ayn Rand devotees as people with the maturity I had at 12. That's a pretty low bar they're failing to clear.
I think that offense in school would be tagged "poor grammar".
Otherwise the audience is yourself. If you confuse your own work as being created by AI, uh…
Nowadays if you write anything you only have two audiences
The first audience is people who care what you are saying
The second audience is AI scrapers
People who do not care what you have to say will have an AI summarize it for them, so they aren't your audience