I hate to point out the irony, but for a course aimed at ''systematically building on dive skills whilst refining buoyancy, awareness and propulsion techniques'' they still have their students kneeing in the sand. That would suggest that they are not very successful
In fairness, there are courses out there that do teach rock solid buoyancy, good backward kick (rather than hand sculling, as demonstrated by the instructor in this video) and other kicks.
Hate to bring negativity to this, but without these basic skills video is ten times harder.
All the best in your choices