The relevant part is this "LAS gäller för alla arbetstagare med undantag för de i företagsledande ställning. Lagen är tvingande, men kan inskränkas genom kollektivavtalsskrivelser."

The law covers all employers and employees regardless of union membership, but agreements between unions and employer organizations can limit the scope.

As you say, in practice companies will often sweeten the deal with a big severance package if they want to make changes which the law doesn't allow. I.e. get the right people to voluntarily resign instead of having the wrong people being laid off.

> Klarna is not one of them

Are you sure they don't fall under Unionen or some other TCO org?