It is tough to have a fruitful discussion about this because Marcia is working off the assumption that gender and chromosomal sex are inseparable, while others think they are distinct. So it ends up with one person saying, "there is no moon!" and the other person saying, "it is right there in the sky".

I can agree that a trans person didn't grow up with the same "concerns, fears, expectations and requirements", but "He can’t be part of the sisterhood" is just her opinion, of course. Plenty of transgendered women have been welcomed by other women, who apparently haven't heard the directive from Marcia to be exclusionary.