You're right but the parent poster was responding to the question of why Stoicism is so popular with men in the modern era. He didn't say it was inherent to the philosophy.
Well, for that specific question, I'd skip all the bro-nonsense and just note that Stoicism is at least superficially quite like the implicit life philosophy that many men acquire from their families and the culture, but organizes that into something more coherent and with a fairly long past. It provides a positive explanation of why something vaguely close to what you already do could be a good thing. The appeal of that seems fairly obvious to me.
Note that I don't seek to demean or reduce Stoicism to "what men do anyway". It is a much more carefully thought out philosophy of life than that would imply, and contains far more insight and potential than "keep doing what you already do". But the fact that it is somewhat adjacent to the pop-stoicism associated with masculinity doesn't hurt its accessibility.
