So what? The topic wasn’t about her being a biological woman. It was about her being a woman and whether she was qualified to have an opinion as the woman she is.

She does accept who she is: A woman born in a biologically male body who chose to change her body to fit who she is.

Now if the topic had been something only biological women experience, like menstruation or pregnancy, your argument would have some relevance. But it wasn’t. The topic was wether or not to trend towards believing women about rape allegations, a topic where it doesn’t matter whether you were born without a Y chromosome.