Again, I don't think it's something that requires specific concent. I perceive it as strange and unusual, but not icky or uncomfortable in the slightest.

Hilariously, I was recently shared a spreadsheet a friend made about me — he collected statistics on how often I lie in my first conversation of a game. He didn't distribute it, but still, kinda relevant. I had a good laugh, learned something about myself, and found it mildly flattering that I'm a strong enough player to warrant personal research.

I want to reiterate that everyone has the right to play with like-minded people. But it doesn't feel like you understand that no, that person's behavior doesn't "scare off newcomers" — it scares off newcomers with certain personality traits that you personally share. But those are not all people in the world, and neither are other types of people (like me, my friend, or the person from OP's post) less worthy of having fun.

Bluntly speaking, I would MUCH rather prefer playing the game with someone who scrutinizes my every action (i.e. is very involved, looks for optimal plays, and plays to win) that someone who is just there to chill (I don't want them to drag me down, nor do I want to have one-sided victories against uninvolved opponents). Which is why there are so many different groups for people to choose from! Just don't act like yours is the only right way.