Well,
It’s too much to engage in a full on biology lesson, but my point stands saying if you are biologically born a male you will die a biological male is too broad and open to argument.
There is lots of variation in biology, so what if a MtF voice, breasts, vagina, vulva, labia, uterus, voice etc are all feminised by surgery. So what if it’s hormone or laser surgery removing the body and facial hair. So what if puberty blockers result in female levels of muscle and bone density. The fact is it’s still biologically permanently done to a male body such that it is no longer biologically male. The human in question doesn’t have to be exactly, biologically a female, to not be biologically male at death.
Even today, the majority of the visible and many of the internal biological markers of a woman are in fact present by death if you are MtF...so I don’t think that one can safely say if you’re born a male you biologically stay male until you die. Too much can be done. So much of your external and internal biology can in fact be altered, be feminised.
Some things are in the near future yes, like pregnancy for MtF. Breastfeeding has been done.
But changing XY to XX is about the only thing in the far future...as in 50+ years away.