When it comes to his Harvard records being made private, or secrecy around his wealth etc, it doesn't mean he has anything to hide, it could just mean that he likes privacy. If I'd be rich, I'd certainly do anything I could to minimize any public information you could find about me or my wealth, why should they be open for public anyway?
The less info there's about you in public, the better, for anyone, doesn't matter if you are poor as **** or rich as hell.