He's Bill Binney. Do you think the NSA didn't change the keys when he left their employ? Do you think he 'backdoored' the NSA without them being aware of it?
That's a lot of confidence in one hackerz skillz, and none in a multi-billion dollar budgeted agency tasked with having hacker skillz. Pardon me if I'm less confident in Binney's competence to turn the NSA database into warez he can scrape at will.
I mean, wouldn't you change the password if a disgruntled employee left the company? You don't have to be particularly tech savvy to do that. That's pretty much the minimum savvy required to even have a password to change.
Even if he has some kind of backdoor to reach that data, it's really easy to encrypt a dataset. You can get an open source program for free that will do that to any data you specify. Even if he could jump right to the database through the NSA security mechanisms, he'd have access to encrypted data.
Trillionaires aren't in the habit of leaving proof of financial crimes available to the public on unencrypted databases. If they had such habits, they wouldn't be trillionaires. They'd be convicts.