Yes. Hersh possibly confused Jens with his father Thorvald Stoltenberg. Who travelled to North-Vietnam in 1970 to negotiate between them and USA, and who was commended for his negotiating skills by the am. intel community in a declassified rapport from 1980.
HN favorite Mark Ames has another theory about Stoltenberg fils that wouldn't contradict TFA: perhaps even his teenage war protest was of the "observe then snitch" variety?
See my other comment for quotes and sources.