You misunderstood. I merely pointed out that Valve did a brilliant job there, and again I am blatantly stating that for, say, someone from the US it is likely not easy to see WHY and WHERE this brilliance is. I had the "fortune" living in Europe and was living for a bit in Eastern Berlin after the wall was down, and of course also know what it meant before when there was still an Eastern and Western Germany, or Soviet Union for that matter... Later on I also met many people who lived in this "Eastern Zone" and got an idea about where and how they lived, how limited their lives were, how "odd" an experience for example Eastern Berlin was...shortly after the wall came down and there wasn't too many changes yet. It is very difficult to describe this atmosphere.
You are right it's a game made by Westerners "for Westerners" but I am 100% convinced that Valve had help by people who had such first-hand experience developing the setting of the game. There is no way that they managed to convey the setting/atmosphere of the game otherwise.
What I am saying, it's no big deal to develop a game with a "dystopian atmosphere" since every other game does this, and there are books, movies etc. and they are not even scarce.
But doing it RIGHT and creating a genuine "eeriness" is a different story. A Westerner would (IMHO) not have an idea about how a person would live in a socialistic society, say, somewhere in some former Russian/Eastern European town, squeezed into some socialist apartment building and then facing realities of every day like how their authoritarian gvt spied on them, limits imposed on thinking, literature etc. because it goes against the authority's ideology. Stuff like that.