ThatBlackCat He doesn't wear a hijab - all the women in his country do.
No they don't. Algeria isn't like Iran where you'll be arrested by the Modesty Police if you don't wear your hijab, or don't wear it in the right way. And then possibly beaten up or killed. Some Algerian women wear the hijab, some don't; some were traditional clothes, some wear jeans and t-shirts.
Algerian sportswomen wear whatever gear is appropriate to their sport.
Here is a photo of the Algerian women's gymnastic team wearing gym gear; not a hijab in sight. They are the official, national team of Algerian.
IK not wearing a hijab is irrelevant. The proof that he is a man is the results of the medical tests that show that IK has a DSD which is specific to males.
I tend to agree with some of what Obeseandashamed says - I'm prepared to believe that IK was wrongly identified as female at birth because of his DSD, and brought up as a girl. Having a strong girl in the family is no bad thing in tradition rural communities, as I remember from my childhood when women did a lot of hard work around the farms. So the little oddball tomboy who played football with the boys was possibly tolerated as just that, a little oddball.
I have some sympathy, having been a little oddball tomboy myself
I don't know at what point IK learnt he was male not female. There was a huge concerted effort, involving everybody from the government down to his coaches, to maintain the fiction that he was female, because he was a national sporting hero[ine] who was going to bring Olympic Gold to his country.
Outside of the ring IK is a national figure, and appears as a woman, and an example to Algerian girls to become involved in sport. He was also made a UNICEF ambassador 'ambassadrice', woman ambassador, alongside a male ambassador.
Whatever his backstory is, it is multifaceted and probably more complicated than some people think. Just as Algerian society is multifaceted and more complicated than some people obviously think..
But the bottom line is that he, and everybody else, know now that he is male and should not take part in women's sports, full stop.