The sub-reddit was made in response to Eliezer Yudkowsky's "Harry Potter and the Methods of Rationality", which I also enjoyed. Not everybody likes it, but even if you don't you'll probably find other works you'll like recommended there.
Yup. People sometimes use ARR to mean multiple things. Previous poster was referring to run-rate which likely was the run rate for GMV--versys ARR which I assume you mean as annual revenue
Don't think this article disagrees with most of your statements. The leverage of money is cyclical--so it's not incongruous that at different time periods the profile of growth vs profitability focus of startups funded varies.