That'd be an "Ask Alex" (nuclear weapons historian and blog author).
Hard to say, as an Australian I've managed in the past to provide some fresh details about tests back to US sources, it's certainly possible for outsiders to have a niche special subject.
It's easy to imagine Russian sleepers in the US tasked with cataloging anything and everything nuclear related .. and a whole lot more as a smoke screen. That'd make for a hoarder scale archive of newspaper clippings and a family versed in playing Trivial Pursuit on dates and descriptions.
Then again it may just be an expatriate Siberian obsessed with warm weather and bare legs.