Smarter Every Day did a YouTube video on this (https://www.youtube.com/watch?v=7CUojMQgDpM) where he talks about the phenomenon and also talks to the exact same guys featured in this New Yorker article. I think he does a much better job than the New Yorker article, too.
Destin also notes that, countries that study curling tend to win olympic medals. He said that in 2014, and it's interesting to note that both Sweden and Canada won medals in curling in both 2014 and 2018. [Edit: Though I believe he did say it after the 2014 games.]