I know what you are talking about. I rarely think about it because I learned it years ago while I was racing. I was doing it even on straight skis. It's really a function of strong foot pullback at the transition. It also involves holding the feet back as you let the hips develop forward. The real ability is to hold the hips forward, ahead of the feet, when it gets tough. By tough I mean icy, steep, ruts and chatter grooves. You don't have to push the feet for the skis to go forward, they do so on their own, as the arc develops, and as the pressure on the tip is reduced. Of course, a skier can never achieve this if they don't make a move to get forward on every arc. As anything else that is learned, it takes a dedicated amount of time to develop this way of slicing, for it to become natural. I taught myself out of necessity, because I was sick of getting back in slalom courses.
I don't talk or describe it often because so may other things are needed before this becomes a limiting factor in ones skiing. I do coach it with racers that are ready. I did so this season with a US Team development racer. He's showing good progress with the idea.