I think the article has some kind of point.
Because of the internet's lagtimes, online do tend to play online with someone from their own country - playing on a Russian server from France really isn't much fun.
So the skilled players from one country play against each other more - they watch each other's games more because they're part of the same community, and as with everything, they mirror what they see.
If one country has a dominant clan of one style, the others would copy that. It won't give them better reflexes if, say, the top clan is good at that, but it'll make them emphasize that in their own game and, in the end, make them have better reflexes because of it.
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I think the article has some kind of point. Because of the internet's lagtimes, online do tend to play online with someone from their own country - playing on a Russian server from France really isn't much fun. So the skilled players from one country play against each other more - they watch each other's games more because they're part of the same community, and as with everything, they mirror what they see. If one country has a dominant clan of one style, the others would copy that. It won't give them better reflexes if, say, the top clan is good at that, but it'll make them emphasize that in their own game and, in the end, make them have better reflexes because of it.