This person's viewpoint sums up something I can't understand about how a person raised as a boy can identify as a woman. If you're raised as a girl then from birth the 'being a woman' seeps into you like you are a sponge. In everything that happens to you and is said to you (or unsaid) you are a girl. The fear of predatory men, the worry about being on public transport alone, the imagining the horror of rape, the need to be 'pretty or quiet or subservient, the seedy uncle, dolls and pink things, the keep your knees together and smile, the how to be a girl in the company of other girls and the how to be a girl in the company of boys. The casual sexism, prejudice, the cat calling when you're barely a teenager, the starting your periods when you are in a class of boys at school, the being treated second best at school/college/work/home. It becomes you for better or worse and is as much what it is to be a woman as having a vagina.
How do people raised as boys assimilate all that when they identify as a woman? And if they don't, then are they a woman?
I hope someone, perhaps someone who has been through this, can explain it to me.