Because scaling supersonic aerodynamics up to a spacecraft with twice the size is nontrivial
I'll grant you it is a nontrivial problem, and being able to make it work on a larger vehicle is a slick piece of engineering. On the other hand, the video presents nothing new about those aerodynamics, nor any of the challenges they needed to solve to maintain the concept in SpaceShipTwo. Instead, to use a car analogy, the video goes something like "motorcycles have two wheels, cars have four. Ours product is cool because it has three, something we first developed over a decade ago. The latest version is cooler because it also has three." When you come to that last sentence I hope you will conclude, as I did, that the creation of this video was not at all worth posting on Slashdot.