Social media is full of people wanging on about really complex DSDs like CAIS and Swyers, but they just want to muddy the water and make this opympic scandal sound much more difficult than it really is.
These two boxers have clearly been through male puberty. That's obvious from looking at their hips and the way they walk. They almost certainly have 46 XY 5ARD just like Caster Semenya and the other two males who won the Rio 800m medals.
The colloquial name for the DS is 'penis at 12'. Males with this DSD typically have a small penis and undescended testicles so they can be mistaken for female at birth. But - and here's the key thing - they go through male puberty. At puberty, instead of having periods and developing a female shape, their voices break, they grow an Adam's apple, they gain male musculature and male body hair. Those changes are pretty hard not to notice.
This whole idea that they have no idea they are male is all media hype. There are photos of Caster Semeya in male school uniform (unlike his sisters). There's a photo of him wearing just swimming trunks aged 15 on a school trip. How many 15 year old girls go topless? Khelif's own uncle said that Khelif was playing football with the boys aged 15 when he was spotted by a talent scout. Strange to let a girl do that, unless of course they knew he was a boy already by then.
We all know that lots of sportspeople cheat, which is why there's daily drug testing. It was a political decision by the IOC to stop sex testing. 82% of women didn't want them to stop sex testing. Now countless women have lost out on opportunities, and women are being put in danger of being killed in the boxing ring.
Here's a video of Caster calling women and girls 'they and them' in an interview. He's so used to only pretending to identify as a woman when he's running races, he often forgets and lets the mask slip.