I wish all my readers would be as generous a reader as you are! That is a very interesting angle indeed, and if it is what the grandparent comment intended, I misunderstood.
I thought it was more like a self reporting thing be a measured. Having a survey with self reporting is probably less accurate than just using someone’s HR record. Although I think the accuracy gain would be from having greater completeness due to less non-reporting than any discrepancy between birth sex and gender.