Interesting performance. _ see how he leans as part of move #1. This is something I saw in progeny of Han Cha Kyo. Never understood it. Asked the General's son about it since I knew he trained under GM Han for a time. he was incredulous. sadly GM Han died before I could ask about it. But I had a chance to ask GM Nam if he knew anything about this variation and he said "That's Han Cha Kyo's technique. " so it seems it was something GM Han did to make it his own. Sadly, his progeny had no idea that is what they were doing. I would no be surprised if this person had strong CDK roots.Here is another pre knee spring/Sine Wave representation.
His walking stance is lower than what you would normally see in ITF. His Round kicks are too squared for my liking but this varies between individuals. There can be such a thing as too upright!
It seems most US splinter groups did not adopt Sine Wave.