Looks like CrossFit HQ wants people to learn proper Handstand Push ups (i.e. non kipping).
I used to do this particular exercise, the Jackknife (or Pike Up) with physio ball, a lot when I trained for my Press to Handstand.
It really helps with with getting the compression right and well as with building shoulder endurance. Also it is a very nice core/abs exercise as well, ideal for a finisher once you get the movement down.
Start with the way they do it in the video and later increase range of motion (by doing it on blocks).