I mean, I sort agree... My interpretation of "bro science" is a combination of some dude getting questionable advice from another dude at the gym, but also on Reddit.

That's effectively what I mean by "Google" in the bro science context. Even there you'll be hard pressed to find anecdotes from TRT supporters who claim it improved their head hair growth. I find a lot that note it increases hair everywhere ELSE but not the head.

Even the remote threat of being fact-checked does wonders to keep people from making up bullshit. I don't know that I've ever heard "TRT improves (head) hair" online, but I probably hear it roughly once a year in the gym. I work out less than an hour three times a week, so we are talking about a fairly high amount of presence for such a specific piece of bullshit.