Semenya has a complex DSD, which is to say the different factors making up her sex are at odds. Chromosomes and gonads = male. Genitalia, birth certificate and sex of rearing = female. It's usual now to defer medical intervention and allow the child to grow into its gender identity. In some countries she might have treatment just prior to puberty (gonadectomy/oestrogen/vaginoplasty) resulting in an adult body with female gross morphology, and her medical history would be nobody else's business.
Semenya has gone through male puberty and should be banned from female competition. Because she has an unfair advantage. Because androgen blockers are a health risk. And because keeping her within the rules incentivises talent scouts to look for these children and persuade their families to choose a course of action for financial gain rather than best medical outcome.
But it doesn't mean anything, or achieve anything, to say she's 'really' a man. She's the one with the DSD, so she gets to choose.
Also, if what her wife is reported to have said is accurate, it's likely that her children are donor conceived (not that it's any of our business). People with this condition do not produce spermatazoa. They can sometimes reproduce with the aid of ROSI, but that is not what the wife has described.