What is the point of gender anyway? The "man" identifies as male because his breasts have been removed? A lot of woman have that done involuntarily and that doesn't make them male. He also was taking male hormones, but 'chose' to retain his female reproductive parts. Why?
Margaret Somerville states:
"Where I would do a reversal on this is to say, 'You've artificially made yourself a man. You're not a man, you're a woman and you're having a baby and you're actually having your own baby. Just because you put on a clown suit, doesn't mean that you don't still exist underneath."
To take a little poetic licence with a well known phrase, it's like putting a jock-strap on a sow.
Obviously the 'man' is still going to have female chromosomes.
Which leads me to the question, why bother with gender at all? Why have it on drivers' licenses and other legal documents? If we can decide on a whim that we'll a particular gender, then what's the point?
And perhaps for "women" who are still oppressed in various parts of the world, that could very well be the best outcome possible.