kata compared to shadowboxing has been discussed on here before, comparing kata to scripted shadow boxing.
Drilling/repeating things is beneficial, regardless if its kata, shadow boxing, bag, or pads. Repetition is what creates the muscle memory.
But we must remember, no philosophy no karate, there was no philosophy in this video. So I dont think we can even call this a kata. More like techniques demonstrated by karateka. Thus the people in this video that were able to repeat this kata, have not learned karate or a kata at all, they are merely repeating movements demonstrated by karateka.
additionally, the movements of this kata, are so complex, it is impossible for anyone to learn this kata, simply by watching this youtube tutorial video.
I mean learning MMA/MT/KB/Boxing techniques off a youtube tutorial video is possible, but kata from a tutorial video is impossible.