The IAAF/WA took great care with its wording to call its current DSDs regs "Eligibility Regulations for the Female Classification (Athletes with Differences of Sex Development)."
This is very different from calling them "Eligibility Regulations for Female Athletes with Differences of Sex Development." Which is the option they purposely avoided.
Further, the IAAF/WA has made it very clear that its regulations for athletes competing in "the female classification" with DSDs "only apply to individuals who" have official identity documents that say "they are legally female (or intersex)" AND "who have one of a certain (limited) number of specified DSDs" that cause them to have four distinct physical characteristics typical of males and males only.
The IAAF/WA describes these four necessary physical characteristics as follows (taken verbatim from the WA website, though I've added the numbers):
1. male chromosomes (XY) not female chromosomes (XX);
2. testes not ovaries;
3. circulating testosterone in the male range (7.7 to 29.4 nmol/L), not the (much lower) female range (0.06 to 1.68 nmol/L);
4. the ability to make use of that testosterone circulating within their bodies (i.e., they are ‘androgen-sensitive’).
So far as I'm aware, there is no DSD condition found amongst biological females that is known to cause all four of these distinctly male physical characteristics. If you can name one, please do.
The DSD regs issued by the IAAF/WA don't apply across the board to all athletes with DSDs seeking to compete in the female classification. Female athletes with DSDs such as MRKH, CAH, CAIS and Turner's are not subject to them.
Also, your suggestion that females with DSDs all have high T and all males with DSDs have low T isn't true. Abnormal testosterone levels are not characteristic of all DSDs for either sex, especially not when these conditions are viewed over the course of the affected parties' entire lifetimes.
Similarly, the most common condition that causes unusually high T in females - or hyperandrogenism - is not a DSD, it's polycystic ovary syndrome or PCOS. Though the press still often calls athletes like the three medalists in the 2016 Olympic women's 800m "females with hyperandrogenism," this is inaccurate because hyperandrogenism is a condition that by definition requires working ovaries, not testes.
The main point is: the current IAAF/WA DSD regs apply only to a handful of DSDs that occur solely in XY people with fully functioning testes, no female gonads, male levels of T, and male-typical sensitivity to T. Athletes like Semenya, Wambui, Niyonsaba and Seyni have ID documents that say they are legally female or intersex, but by all biological measures they are males.
And biology is what matters most here. Not legal status, claims to having an opposite-sex "gender identity," or mistaken beliefs about one's self regardless of how/when/why said beliefs were initially acquired.
https://www.worldathletics.org/news/press-release/questions-answers-iaaf-female-eligibility-reg