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You're speaking of "sex," not "gender" -- the former is biological and there are two of them; the latter is cultural or social and there could be arbitrarily many.

I say this while being a conservative; the semantic distinction is a useful one, although attempting to blur the distinction between a (biological) sex and a (cultural) gender never does any good.

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Why couldn't patio11 be speaking of gender? In fact, I think a study measuring gender would identify with even more accuracy, although data collection would be harder (you would need the authors to report how they identified). Anyways, the linked study uses the word "gender" - it's probably conflating the two, as often happens.

... because he said that it is objectively verifiable

Which gender is. Your gender is how you identify, so unless you are lying to a researcher who asks you what gender you identify as, it's objectively verifiable.

there are intersex biologies to account for if you want to be very precise

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