Actually it's a combination of literature I've read and Russian people that I've met. Maybe it's just the people I've happened to meet, maybe they were just Ns. Maybe I've been more exposed to the N side of Russian culture...but I will say this: one of my friends whom I met after he had only been in the U.S. said that American people seemed "lonely" to him, he was very aware of American distance, fake happiness...a lot of the stuff the author just wrote in the passage you linked.
Most Europeans think that because USA is much more enneagram Three-ish than Europe. Ambitions, money. We dont live for money here. I cant believe people work in USA for 60 hours per week.
also, we move a lot less. i am sure russians do too. so we keep friends and family longer, we arent used to switching friends... which makes us less lonely but americans are probably more used on this.
Just saying. I also think Russian humor might take some leaps in intuition. I remember reading Uncle Vanya when I was fifteen and thinking it was funny, like what is this, and where can I get more of this. When I told this many years later to my math professor (who is from Russia) looked at me like I had three heads. He said, "surely you have relatives from either Russia or somewhere in eastern Europe" and I said, "well, no, not recently enough that I would have been able to meet them." He continued to stare at me for a moment, and he said, "It's very strange for a young American girl to understand Russian humor without being given some context. A lot of adults in the United States don't get it...they think it's all dark and sad."
That led me to think there was something N going on in their culture, where as ours is more ESxJ.
Maybe it's the pain of poor nations? you know. Pain, poverty.. it all brings people together, and brings up deepest feelings. This is why in Croatia during war I felt much more connected with people because NF stuff was more important, deep feelings, life, death.. so Russia is nation full of pain and poverty, so they feel everything more deeply.
But I still think it could be SJ country with lots of passion. Because, most countries are SJ, it's not democratic and all. SFJ can see very passionate in NF way.
in deep poverty many things seem more NF because people are pressured to think about "important" things.