I'm an active member of the discord and reddit community of the ARG, and you will not beleve the conclusions we have made as a community.
This is connected to valve and a game, all signs leading to Half-life.
OR, Valve is the ultimate troll, getting pleasure from fools like me and 50k more people :D
All is well with your theories (i'm surprised i haven't found this post earlier), but there is only 1 problem. The suppression device is located in the Belgrade Parliament building (this has been confirmed by Viktor himself), so i'd say it's a mix, but it is probably somewhere in the balkans...
Here is the greenlight page and here is the story on eurogamer about it.
Firstly, i like the idea and the mod/game from what i've seen so far.
Secondly, this guy has a really interesting approach (sending a briefcase to valve and all)
And lastly, i think this will succeed in being a great...
For anyone who hasn't played this:
It's an interesting what if scenario of the HL2 stroy, where the humans never surrendered. It has a few weapons from the old hl2 story and files (Play MI mod for more details on those), plus a few new over the top weapons, and a crysis-like suit management...