During the corresponding time period, companies can arrange skills training. In cases where that isn't possible, workers will be released from their employment to a corresponding degree,"

Most people would call this a cut in working hours, not a cut in wages.

Most unions does not have a millitant attitude against cutting working hours in times of crisis.

Any proof of this being a "historic shift" in swedish labour union attitudes will have to include evidence that swedish labour unions have always opposed these kinds of measures before. I will be surprised if this was so. But feel free to prove me wrong.