You need around four years living in Sweden, and pass some basic language tests. It’s not very hard.
I’m skeptical.
In any case blonde girl Sweden and human rights Sweden are not the same place.
https://www.migrationsverket.se/English/Private-individuals/...
The visa process is relatively painless. Much simpler than the the process for USA or UK. All you need is a job offer.
So not really comparable to an independent nation of Sweden.
In that sense, Sweden’s exposure to potential internal migration is much higher.