Also, not that it matters, but a "DNA test" is not how you find out if someone has XX, XY, or XXY chromosomes. The word Rowling is looking for is "Karyotype." But hey, if she knew how gender science worked, she probably would not be a TERF.
Dang I took bio in uni and I forgot the word karyotype existed. No excuses for rowling, I refer to others as they identify instead of focusing on "oBjEcTiVe eSsEnTiAl LiFe FoRcEs" like DNA.
They still have the british eugenics society over there, though after their second name change they are now the Adelphi Genetics Forum, I like using their old name though since I think it represents them better.
Well, the entire Harry Potter idea, from the "child born of a witch and a wizard survives the murder of his parents and is left with a mysterious magical mark by their attacker in a contemporary setting" to the fucking name Harry Potter itself is from a 1980s movie called Troll, so in a way yeah she's a "squib" in that she didn't really "conjure up" the setting to begin with.