I don't think it is HH's drill. The drill has been there for long time, and has been used widely to train racers. The official name is Sch...... I don't remember the exact name.
我的看法有点不同. 除了Directional Movement, the most critical element of this drill is to create a sensation of a leveled hip. 从录像上看, 滑雪者好象并没有做到这一点, 因为我看到了内脚承重的现象.