Sweet turns nolo
Most of that video on Hood isn't very usable. Doesn't the camera have a zoom? I seriously doubt that those are US Junior Team skiers. Do you have any names?
Yes, Diana starts each turn with tips divirging. Why? She's in the backseat(As Harald appears to be at the start of his turns. It looks like he may be divirging too)
How do I know? The new outside ski tracks out away from her until her leg extends and the shovel engages. Meanwhile she's holding herself up with her inside ski and pointing it where she's trying to go.
Watch nolo's turns. She glides onto her uphill ski as the leg starts to extend. Her CM is going straight as the ski continues to carve into the hill(CM is crossing). As this happens the ski is rolling over and her leg extends more bringing her hip forward. Notice how her foot appears to go back in relation to her hip as the transfer progresses. Conversely, notice how Diana keeps her leg bent until her ski runs out away from her. Notice how she's carving on the tail initially. The turn needs to be initiated on the tip of the ski for a clean "turn in"(sorry about the race car talk) That's what inside leg extension does, it brings the hip forward so the turn can be started on the front of the ski. It starts as a rising motion and turns into a lateral move down the hill. (Horst Abrahms wrote, in about 1980, "At the highest levels the extension becomes mostly lateral")
Fastman was talking about a modern, high level move that he observed in some of the most skilled racers. The "wall exercise" he describes is a pretty good description of it. At the time I wasn't sure we were talking about the same thing. After I saw that I was sure we were on the same page.
As far as trying to relate it to PMTS, I don't think you can. From what I've seen(and heard) Harald doesn't advocate a lot of extesion(read up and down). He and his disciples, including the ones around Tyrol, all seem to ski kind of "hunkered down". I've played with some of their stuff and find it a limited movement pool. It doesn't allow for the kind of athleticism demonstrated by nolo in her clip.