Why assume that was served on the link, and how it was served, is working as intended?

It could have been part of a phishing setup that got accidentally pushed out with obfuscation components still missing.

It's not like everybody working at NSA is a flawless human being, mistakes happen everywhere, sometimes even rather big ones.

Also kinda weird how everybody seems to be giving the NSA the benefit of the doubt of this having some kind of supposedly totally benign purpose, completely ignoring the NSA's history and purpose.