If the IBA were going to make something up to justify disqualifying these two boxers, don't you think falsely accusing them of being men would be the dumbest way to go about it, due to how easy it would be for the boxers to prove it's a lie?
Bit of a coincidence that the two boxers the IBA flagged as having male chromosomes and an unfair and unsafe advantage over women won every single round of all of their fights against women at the Olympics if the IBA are fibbing, isn't it? Something no other boxers in the women's category managed.
Maybe the IBA have a crystal ball and concocted their dastardly plan based on what they saw in the future.
Or maybe they're just telling the truth because there's no reason to lie about it?