Earlier quoted context omitted.
I imagine the NSA has a fully mapped out network layout for most major foes continuously updated in some sort of inventory database but for enemies, the same way they track large military gear and in which bases its at for their enemies. So yeah this seems very strange.
NSA and similar agencies are probably even mad at him, because he exposed the weakness that they could have exploited when needed, which is probably now patched.
Then they should have caught this when he came forward to multiple agencies, and was told that no one cared.
Please see my related comment as to why I submitted his AMA to HN. It's to bring to light this egregious lapse in US gov procedures:
https://news.ycombinator.com/item?id=40733355
Disclaimer: I do see the possible benefits for citizen liberty, where all agencies do not share every interaction with citizens. However, when a US citizen volunteers something actionable, there should be a special cross-agency path.