Musically they have no connection whatsoever to Swedish folk music. Swedish Wikipedia call their music "etnopop", I would simply call it mainstream pop.
Wikipedia states:
Etnopop: "Den omfattar alla typer av populärmusik som tar inspiration från icke-västerländska eller forntida kulturer i sitt musikaliska och visuella uttryck."
=> Ethnopop covers all types of popular music that takes inspiration from
non-Western or ancient cultures in their musical and visual expression.
i.e something like a
fantasy folk music.
I don't know, I guess hardly something you ethno-fans wants to hear.