@robin1984: The first section of that article, pointing out that some people are not XX or XY, refers to intersex/DSD/disorders of sexual development. These are rare in the general population: the Intersex Society of North America (isna.org/faq/frequency/ ) says frequency is between 1/1500 and 1/2000. And quite a lot of intersex people are pretty pissed off by the hijacking of their condition to make the trans case. Check out @intersexfacts on Twitter.
The second section, on "sexed brains" is complete, copper-bottomed nonsense. And incidentally, is much more akin to the sort of stuff that Mermaids put out (the "Barbie to GI Joe" scale www.butterfliesandwheels.org/2019/the-barbie-gi-joe-scale/ ) than anything any self-respecting feminist would say or subscribe to. Women as a class are discriminated against on the grounds of biological difference (smaller, weaker) and capacity for childbearing (going to go off and have babies rather than progress up the greasy pole), not some mythical brain structure.
I can't be arsed to carry on. There's gin to be drunk. Can someone else take over for the remaining paragraphs of complete bollocks?