Earlier quoted context omitted.
I don't think there is anything fishy here, although I don't think the NSA can just install anything on my computer, even if I were based in the US. There is a lot of bluffing when it comes to cyber security. Still it might be quite a useful tool.
If they could install a virus on Iran's air-gapped uranium centrifuge industrial control systems, I'm pretty sure they could get one on your computer.
On the other hand individual security professionals might have wildly different ideas about risk tolerance and convenience, which they also have privilege to change on the whim.