If you look at the data, our right wing populist party saw a small decline following the financial crisis. They saw two major increases, one following 9/11 and one at the height of the European migration crisis but at this point our economy had fully recovered.
I think it's some what like this around much of Europe. Back in 2001 we got critiqued by the European Council because we elected a racist party to government, but Austria recieved much sterner critique at the same time. In Eastern Europe the local economies have seen huge increases along with right-wing populism. Greece, who took the worst of the financial crisis, turned to the intellectual left, not populism.
I think the article is probably on point about America. The tea-party saw it's dawn in the years following the financial crisis. You had the occupy movement and now you have the alt-right. We didn't really see similar movements in Europe though. I guess we do today, and I think we're unfortunately receiving a lot of bad influence from America. I mean, I can go on the Danish subreddit right now and see people complain about the MSM. Which makes no sense, because our media-landscape is completely different from the American. On facebook we have anti-vaxxer and flathearter groups, mostly using sources like infowars or breitbart because we simply don't have nonsense-media equivalents in my country. At least not yet.
So I guess, in a way the article isn't wrong, but all the nonsense is happening in an economy that's mostly better than before 2007.