I don't know the details of the data in glassdoor, but most of my friends in China in the IT industry (at my age , usually senior devs) make more than my Swedish colleagues. And I worked in some of the best known companies in Sweden.
I have to say, this articulated a lot about what I felt as well. This is what I mentioned in the article that I don't agree with all the policies Sweden is taking, especially when it comes to immigration. You explained it much better.