People do. And then use the results that demonstrate they aren't to demonstrate that gender is a spectrum and there are no binaries.
"That mask is a potent symbol of her struggle to rip apart preconceived notions of gender and gain recognition of her own gender identity--that biology is not black and white and that shades of gray should be celebrated, not denied.
Xora was raised as a boy and began presenting as a woman when she turned 25. For years, she believed that she had androgen insensitivity syndrome, or AIS, a condition that causes person who is genetically male, with XY chromosomes, to not respond to male hormones. She identified as intersex, and she thought she was lucky to escape to invasive, painful, and often lengthy surgical procedures that other intersex children undergo, a practice that the United Nations has recently denounced as "torture."
Early this year, chromosomal tests showed that Xora was mistaken—she does not have AIS. She says that this only adds to her belief that gender does not exist on a binary—and that neither trans nor intersex people should have the suffer for that."
https://archive.is/ARGbR
However, currently, in sports, a test that demonstrates that somebody
- is male rather than female or
- has a VSD
is used as an argument that they are the sex with which it's strategic to identify.
Notably, Zdeněk Koubek, a medal winning athlete in the 1934 Women's Games (back when women couldn't enter Olympics and there were no women's events) opted to live as a man after learning of a VSD. afaict, there was nothing but positive and supportive press about this decision. Koubek (voluntarily) handed back the medals and Koubek's records were cancelled.