Speaking strictly to the sporting regulations, it's not about what's between the ears. I might have seen myself as a woman. But if I'd been allowed to play women's basketball when I was in college, I'd be famous right now (for being a "woman" with a goatee, in addition to all the scoring and rebound records I'd hold).
I don't know how intersexed people are classified in international sports. But it doesn't matter. This should have been handled behind closed doors, until there was some actual proof of some rules violation. By bringing this up publicly, it is taking away from her success, and calling into question the legitimacy of her wins. Apart from the intersex thing, some may assume she's got masculine traits because of drugs or something - and that would be cheating. So yeah, that's absolutely defamation. What sponsor would sign her on in years to come if there is a cloud over her? It's defamation that would likely affect her future earning potential.