Re calling Lin Yu-ting a man - one of JKR's many alleged transgressions.
LYT has a DSD called Complete Androgen Insensitivity Syndrome (CAIS), which means he has XY chromosomes and is male, so if JKR called him a man, she was correct.
For now, LYT is considered eligible to box in the next Olympics. The justification is that because of CAIS he didn't go through male puberty, and did not gain the physical advantages associated with that.
It's controversial, but at least a coherent explanation/justification has been offered, i.e. that the IOC's rationale for excluding men from women's boxing - safety, fairness, etc - does not apply to a male with CAIS.
This is an improvement on 'It says 'Female' on his passport' which was the only eligibility rule at the Paris Olympics!
It will be interesting to see what happens if Imane Khelif takes the IOC test, and tries to compete at the next Olympics. The test will show what previous tests have shown: he is male with a different DSD, 5-ARD not CAIS, and has been through male puberty, so the argument used to justify LYT's eligibility will not apply to him.
Sorry for the derail into Olympic eligibility!
More to the point, I repeat: if JKR called LYT a man, she was correct.