An elevated level of testosterone

hormone that can increase muscle mass and strength.

Well yes – because only men have this particular form of DSD. He has perfectly normal levels of testosterone for a man.

As they admit.

It was in the Cas ruling that Semenya's specific DSD was confirmed as 46 XY 5-ARD (5-alpha-reductase deficiency). People with this particular DSD have the male XY chromosomes.

Right at the bottom of the article. Yes, he's a man.

And he has two children with his wife Violet.