Please skip this post for those who don't want theory distractions, but I think important to show to lurking TRAs that we do engage with these conversations. I'm not any sort of expert except being good at spotting logical flaws in arguments.
From a logical perspective that is perfectly consistent with views that one fundamental issue is sexism within society from an early age - i.e. also women who are into less womanly pursuits may be more likely to be viewed externally as less womanly. And develop a distressing dysphoria that they aren't a woman.
One way to test this hypothesis and I don't know if anyone has, is to separate physical and psychological aspects of sexism and see how far those who display psychological aspects grow up with dysphoria or not, along with self reports of sexism etc.
For example, like many in my family I was talented in the maths and sciences and was subject to sexism i.e. girls aren't good at maths, girl brains are different to boy brains and boy brains are good at maths. I also enjoyed playing cricket, mainly with boys. This led me to feel like I had in some sense a male brain. Utterly silly and I grew out of it.
What is womanly is utterly different over time. Computer science used to be dominated by women, including some of my female maths family because accounting, another employer of maths graduates, was more sexist towards women. It is just anecdotal but it concerns me that the few FtM I know work in computing.