This is actually very interesting. I am really curious what their rules are for someone to compete as a woman.
I find it interesting that they call it a "Gender" test, as Gender is not actually a biological term. For example, someone with male genetalia, hormones, and genetics could in fact be considered of the female gender. It is a psychological identity term. If they are looking at only if she is a biological woman, then they would instead be doing a "Sex" test.
My guess is they only allow full transexuals (who have both changed their gender, and their sex through surgery and hormone treatment), but it is tough to tell.
Of course these are relatively new terms (or uses of them) for many scientists, let alone sports writers, so perhaps they just didn't report it correctly.