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It's a matter of testosterone tests, whether it comes out negative or positive, the test decides, mind you, they are women by birth, but their testosterone levels give them an advantage.
On the other hand, let's not complainer about these situations for something that in the Olympic Games is just a situation, there are more than 10,000 athletes giving it their all.
Then, you can read on or infor it, this is not new, perhaps you are just finding out, but there is a more well-known case and this woman even won world championships and Olympic games.
Caster SemenyaMokgadi Caster Semenya OIB (born 7 January 1991) is a South African middle-distance runner and winner of two Olympic gold medals[4] and three World Championships in the women's 800 metres. She first won gold at the World Championships in 2009 and went on to win at the 2016 Olympics and the 2017 World Championships, where she also won a bronze medal in the 1500 metres. After the doping disqualification of Mariya Savinova, she was also awarded gold medals for the 2011 World Championships and the 2012 Olympics.
Source:https://en.wikipedia.org/wiki/Caster_Semenya