This must be in answer to another thread, but I concur about the white pass turn demos shown here in the 4th video, they are functionally correct, though not the smoothest ones I've seen. I've never heard of the "up-and-over" drill, so thanks for sharing that, but I agree from the videos shown here, they appear to be almost like reverse white pass turns.
Both are one legged drills, but the main point of white pass turns is to demonstrate you can move your CoM across into the new turn while being weighted completely on the downhill ski the entire time. Thus the leg change happens back around the apex in order to clearly demonstrate that you've made the edge change without using the uphill ski at all. Some of these videos are quite sloppy and I agree there is a lot of misunderstanding from many folks about how and why to time the leg change.
Conversely, this up and over appears to do exactly the opposite, clearly make the edge change and crossover while standing only on the uphill ski. Though Mikela seems to wait a bit late to change her stance to the uphill ski. I'm not sure whether that is by design, thusly making the timing of up and over leg change different then the timing of white pass leg changes. Or it could be she is cheating slightly and and earlier leg change would have been more beneficial for the drill. I'm not clear on the precise goal of it.
Many people are confused about the goal of white pass turns. it is not to prove you can ski on the inside ski. Skiing on the inside ski is a neccessary evil of the drill in order to accomplish the one key thing that needs to happen, which is to make the edge change and crossover entirely standing on the downhill ski. In order to make a clean and complete edge change on the downhill ski, you will unfortunately have to start the next turn on that downhill ski as the inside ski. However, once the CoM has moved across and the edge change has been demonstrated, you can set the outside ski down and stand on it for the remainder of the turn, that can happen before the apex even, and ski on the outside for the remainder of the turn, demonstrating another clean edge change and cross over standing on that one as the downhill ski again. So there is only minimal inside ski balancing, during the end of the crossover, which is the init of the next turn. After that, you can and should be on the outside ski.
Many people get confused about the execution and overly focused on balancing on their inside ski, which is missing the point of the drill.