This is laughable.
Snowden needed assistance (from J. Assange) on how to use a data scraper, keystroke recorder (to steal credentials) as well as other simple hacking tools.
Snowden isn't some fantastic hacker and definitely not a computer engineer. He was a below average consultant working for a defense contractor. Which means, you need some computer training and a security clearance to get the job. No need to handle responsibility, just an ability to follow written directions.
He's not exactly someone I'd count on to provide advice or an endorsement for anything regarding encryption.
Now, if I needed advice on how to run like a beotch--coward, then he's the one to seek out.