gijtyd

These are surprisingly common examples. The idea behind the first is to redefine sex as a collection of attributes, and then claim that because a significant number of these attributes have changed, then sex has too. So a transwoman who believes this may point to his estrogen levels, breast growth, etc. as an indicator that he is female. This is why many claim to have a menstrual cycle too, it's intended as further indication of being female.

When people say that their gender doesn't match their sex, they're expressing a rejection of their material existence. These are men who don't want to be men, and women who don't want to be women. I think it's no surprise that many then engage in self-deception, looking for ways to support a belief that they aren't the sex that they actually are.

Not true - if you go on social media such as Twitter and Reddit, you'll often see trans people making the claim that they've actually changed sex. Along with other nonsense, like transwomen claiming that they have a menstrual cycle.