I'm actually not sure how that follows. Intersex, to the best of my knowledge, is generally considered a rare exception to the norm of the human condition. There are similar exceptions in the case of chromosome sexual division (XXY and so on rather than just XX and XY). I don't think that the exceptions disprove the rule in this case.

I'm not sure how they fail to disprove the rule. If all of Creation is in God's Image and by God's Will, then the intersexed and chromosome sexual division deviations must demonstrate that the binary state of man/woman is not, in fact, God's Image or God's Will. We're not discussing statistical norms here, we're discussing God the Almighty. For the world to be simple and black and white in this regard, there must be no exceptions. If there are exceptions, then things are more complicated than otherwise claimed.