I don't feel the need to question, because I'm confident I know the answer. It's to make transmen feel more comfortable in groups discussing menstruation, menopause and other issues which are a consequence of female biology.
And trans identified males?
But seriously, erasing the societally undertsood word for one cohort to make a sub group of the same cohort feel more comfortable?
OK. Then, yet again, what about the women who have no idea that tehyare cervix havers etc - the 46% of women surveyed by/for the NHS, if I remember rightly.
(And as far as I can see from @Gerlais's posts, she was not prevented from calling herself a woman or identifying as a woman.)
So you missed the bit about having been thrown out of the group and not having been able to defend her viewpoint? No allowing her agency, to ask to be called whatever she prefers (which is what the TRA perspective as all about). No! Just a peremptory TERFing out!
You are splitting some very fine hairs there!!