We can't know it's "against the law to divulge those specifics" without knowing the specifics.
Off the top of my head, things that would be illegal (or even actionable) to report on would be health/medical information protected by HIPPA, certain academic information protected by FERPA, if he was the victim of a sexual assault (rape shield laws), sexually explicit material, recordings make without his knowledge, private information that was stolen (think of a data breach / hacking situation), or certain (very limited) sensitive personal information (things like bank account numbers and phone numbers). Most other stuff is fair game, especially now that he's somewhere on the "public figure" spectrum via profiting off his name, image, and likeness (so he torts like invasion of privacy that may pass for common folks may not apply to him).
If he spent all of his money on blow and hookers, divulging that fact would not be against the law.
If he got into a car accident being a knucklehead, divulging that fact would not be against the law.
If he violated some team rule, divulging that fact would not be against the law.
If he's homesick and wants to go back home, divulging that fact would not be against the law.
If he missed practices and team meetings without prior approval, divulging that fact would not be against the law.
There's certainly reasons not to divulge some of that above. "The law" is not among them.
