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He is wrong right from the get go with the "phenotype constructed from traits" BS. He is talking about secondary sex characteristics, not primary sex characteristics. Conflating secondary sex characteristics with sex is an old TRA trick to confuse people who aren't biologists. This guy is lying through his teeth if he actually is a biologist or dangerously misinformed if he isn't. You cannot change your actual sex by changing your "phenotype" aka your secondary sex characteristics.