Free Skate is skate skiing without any pole planting.
It’s used by racers for downhilling when they are moving too quickly for Two Skate or if they are tired.
Free Skate is different from skiing without poles. Skiing without poles is simply a drill you can (and should) do to improve your skiing ability.
Free Skate is an actual technique used in everyday skiing and racing. Notice in the video how Kai actively swings his arms and poles as he Free Skates.