If a Woman Grandmaster (WGM) transitions to a man, does he retain the WGM title? If a Woman Grandmaster (WGM) transitions to a man, does he retain the WGM title?

Related, but not part of this question: Are there any rules for transgender players in chess? which establishes that if a male GM transitions to a woman, she does not instantly acquire the WGM title, but says nothing about the reverse situation.
FIDE has not ruled on that possibility yet.  No national federation is known to have ruled on that yet. 

A related case is going to the US Supreme court that might influence how others do eventually rule should such an event ever actually happen.