You can be born legally female with two X chromosomes - and also a Y chromosome, which gives you a male body.

No, this is known as Klinefelter's Syndrome, and it does not make you "legally female". I know people with this disorder and they are unambiguously male, and they would be quite offended if you called them female, and they also happen to think trannyism is bullshit.

Thinking that these rare genetic disorders is some kind of gotcha that justifies tranny ideology is ridiculous anyway, but they're not even being honest in their description of these disorders.