Where's this from?
The person seems to be so close but so far from the truth of the matter. It's not how your body is made, it's all about your brain and, some might say, spirit. It's a simple fact that boys and girls are different, in both body and mind. So what happens if someone is born with a boy's body and a girl's brain? That person will generally end up being transgendered in some way.
Hey, I'm into things like video games, sports (to an extent), and computers, but I still feel like I'm truly a female yet I was born "biologically correct". I still want to have a female body to match my female brain, including my genitals. Where does that leave me in that silly hypothesis this person has?

That's my two cents, anyway.