Second, you're focusing - again, in this thread - on the ability to produce offspring. Which cannot be determinative of sex because of all the people who can't have kids and are still male or female.
And again, like I said (likely) said in the other thread - it's not the sole determinative of sex.
What I'm saying is that if you can produce an egg, then you are automatically female. That doesn't automatically mean that if you can't produce an egg you're automatically not female (or automatically a male). I mean young girls obviously can't produce an egg, that doesn't make them not female, does it? But your characterization of my statement would make it that way.
Alternatively, if you can naturally fertilize that egg, you are automatically male (which may be the case here, and may also still be the case with Jenner). Again, that doesn't automatically mean that if you can not fertilize an egg that you are not a male, or a female. I never said it was an "all or nothing" characteristic.
If this student could naturally fertilize an egg, I'm not sure how you or anyone could then say he's not in fact biologically a male. She can identify any way she wants to, that's a different question.