However, the women I mentioned (like Bronte sisters) were not "punching up", they were not "punching" anyone in any way whatsoever, the choice of persona has no relation to some kind of aggression, they're simply choosing an arbitrary identity and that's it, there's not the slightest moral concern about this act, it's a well-established (and frequently used) writer's right to choose a pen name or persona and there's not the slightest thing wrong about that, no matter which group is adopting which persona - and the same applies for those three writers choosing their pen name. "Punching up" is considered less aggressive than "punching down", but adopting a persona is not even on the same scale, there's zero aggression about that.
On the other hand, attacking writers for their choice of pen name is punching. In this case it is the less-bad version because it is "punching up", but it is a form of bullying; a much more aggressive act than what those three writers have done.
2. Explain why it is good to take ‘privilege’.
Either their writing was great and would have been successful regardless, so it doesn't matter. Or they were successful only because their pen name was a woman's name, and then women have more privilege when it comes to publishing.
I don't mean to throw shade, it's simply the inescapable nature of cultivating a public image. Mola may be fiction, Gimeno is "based on a true story" fiction. (And interestingly enough, pen names are a time honored literary tradition.)
So when I see statements like the one you quote, my brain immediately interprets it as deflection. After a bit of turning it over in my head, I expect it's not a purposeful deflection but still find it worthwhile to make explicit. It leads us to the question: to whom and for what reason(s) is it important I see the distinction as meaningful?