Again: which experts were saying what was impossible, which was then revealed to be possible by the Snowden documents?
Is the claim that there was adequate court oversight of operations under those codenames which then turned out not to be the case? Are they referring to specific excesses of the agencies? Breaking certain cryptographic primitives presumed to be secure?
Why is absolutely no one who knows all about Snowden ever able to refer to the files with anything more then a bunch of titles, and when they deign to provide a link also refuses to explain what part of it they are reacting to or what they think it means - you know, normal human communication stuff?
(I mean I know why, it's because at the time HN wound itself up on "the NSA has definitely cracked TLS" and the source was an out of context slide about the ability to monitor decrypted traffic after TLS termination - maybe, because actually it was one extremely information sparse internal briefing slide. But boy were people super confident they knew exactly what it meant, in a way which extends to discussion and reference to every other part of the files in my experience).