To me and Occams razor that sounds more like a stuck key than the NSA openly deleting stuff in a manuscript while you're writing it.
But on the other hand, they wouldn't be in this guy's computer anyways because even if NSA were out to oppress him, he's pretty far back at the end of the ol' pri. queue. "Oh, no, not a manuscript, OMG, get Gen. Alexander on the STE-III!"
The CIA on the other hand, competes with the NSA for resources and jurisdiction.
Right now the NSA's budget dwarfs that of the CIA, since data collection and SIGINT have been prioritized over HUMINT. Technology advances and cost reductions might have encouraged this.
What types of intelligence and which agencies will be more relevant in the 21st century? The Snowden revelations and ongoing saga will play a large part in affecting future views, and answers to that question.
It might be more beneficial for the CIA to actually step back.
Plus, a lot of people want to see mass surveillance fail. It's pretty obviously a threat to democracy waiting to happen, and most people in service are dedicating their life to protecting democracy.
I think also you're overstating how much the CIA might be competing with the NSA. Sure, at the highest levels, this might be true, but in the trenches, operatives share everything. I doubt anyone in the CIA truly resents the NSA and they'd happily help each other out like this.
I certainly might be. It's interesting to consider though.