These are really great videos. This has been something I've wanted to do for quite some time, but as company's go I've just been too busy with other projects. Hopefully I can do something more directed towards U.S. players in English.
I thought it was pretty straight forward. I didn't translate it, but I understood that the 3 clips with different players were showing the backswing, point of contact, and follow through. Then the rotation of the wrist is similar to throwing a frisbee. Understanding which types of spin you're looping I believe was the last segment showing how to do different trajectories.
It's one of the reason's it's so well done because I think many people can understand it just from watching it a couple of times.