He certainly is not a traitor for exposing the NSA for its snooping in the lives of private citizens, and then lying about it.
The news says he took that job with the express intent of finding something to rat on them about, but he denies that accusation. And if they were not doing anything underhanded they would not have reacted as vehemently as they did.
He did not expose any "secrets" that would jeopardize the country, and embarrassing the NSA is hardly an act of espionage, or treason.
They are clearly grasping at straws to make this man look worse than he has made them look. The NSA is acting like an overgrown bully that got caught at something they should not be doing in the first place.
The greatest threat of any agency collecting all data on anyone leaves that person open to scrutiny in a dangerous way. It is much like a prosecutor at any trial, they take bits and pieces of unrelated information and spin an imaginary scenario that convicts people without any real proof of wrongdoing or any intent of ever having that desire by the individual.