Last I heard his chromosomes are XY, and he has high enough levels of testosterone that he was disqualified last year. That's a male, pronoun should be "he". I'd only grant "they" if the chromosomes were unknown.
He may be, as you say, a genetically defective male. But that doesn't make him a female. Pretending to be female is a falsehood that enables him to beat up real women. Shameful, IMO.
Please note: I have no objection whatsoever to creating multiple categories for trans, hermaphroditic, and otherwise non-normal contestants. Let them compete among themselves and win trophies honestly.
Great idea! Hint: The Paralympics start right after these games have finished.