This is great news! It confirms that the attack on Oppenheimer was politically motivated. He was a victim of the Red Scare. Even without this evidence it seemed unlikely that Oppenheimer was not a spy.  It was clear that he was targeted simply because he opposed the hydrogen bomb. The whole affair was shameful!!

Transcripts Kept Secret for 60 Years Bolster Defense of Oppenheimer’s Loyalty – NYTimes.com.