alt Hacker NewsWhat I would suggest as a pathologist who deals with diagnosing these: the incidence of differences of sexual development is somewhere between 1 in 1000 - 4500 births. So this policy will not unlikely diagnose someone with a DSD who didn't know.
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When I’ve researched this it’s turned out that among elite athletes it tended to be a bit higher since some of these intersex conditions can confer benefits
It will certainly do that. Previous attempts at this (the Olympics did genetic tests from the 1960's through the 1990's, other organizations have done similar tests into the present) always did wind up discovering cis women raised as women from birth, with female presenting genitalia, who failed whatever genetic tests they were doing. At least one of these women even went on to give birth to a live human baby! You would think that would prove that they actually were a woman, but their medals were still kept from them. They were still driven from the sport, branded as cheaters, etc. Because someone who was so much better than the rest can't really be a woman, they have to be cheating somehow, they have to be a man.
In fact, I'm not aware of any genetic testing program ever catching any deliberate cheating, only people who were raised from birth as women. The very first example of this, (1), Dora/Heinrich Ratjen (2) seems to have been an intersex person who was definitely raised as a girl from birth who was a bit confused about what their body was doing. But all the way back in the 1950's when their 1936 Olympics became a big deal, we have lurid tales in the English language media of deliberate cheating that don't seem to have been supported by anything that Ratjen ever did.
1: http://linuxmafia.com/faq/Essays/marriage.html 2: https://en.wikipedia.org/wiki/Heinrich_Ratjen
Have we forgotten about Caster Semenya already?
Women with DSD on averave have a higher testosterone level. Testosterone generally makes you better at sports. The Olympics select for the very best athletes.
In other words: the Olympics are selecting for women with DSD, so once you start doing 100% testing you'll find an incidence far above that of the general population.