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Sure, but that just sidesteps the problem here. The claim is trans women have female biology simply as a function of their identification as a woman. Therefore, it's possible a person has exactly the same biology as they had as a man, but now they are biologically female.
So in terms of your example, it's a bit like somebody declaring that they are now gay, but nothing about their sexual orientation has changed. They still have exclusively heterosexual sex, fantasies, desires, etc. This sort of thing would certainly result in raised eyebrows...
But more significantly, it would render the concept of being "gay" meaningless. There would be nothing to distinguish being gay from being straight. Which might be fine, except then you need another term/concept to describe real material differences between sexual orientations.
So it's the same with the point about biology. You can certainly render the concept of "biology" subordinate to gender identification. But it doesn't get you anywhere, because the concept itself simply becomes redundant. And you're still left with real "biological" differences.
Your general point about why people might detransition, I entirely accept, of course. It is no doubt a complex phenomenon.
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