That sounds completely plausible. Three letter agencies have ridiculous amounts of intel. They for sure know which building and apartment I'm commenting from and I'm a foreigner on a pseudonymous website. Plus there's the however-many eyes agreement for when you need to get intel but can't spy on your own citizens.

Honestly I'm reminded of that time when Russians found that guy with 3 copies of The Sims when the security services were obviously told to find him with 3 sim cards so he'd look extra guilty