Ian,
While I believe he is competitive, Ken is much more well known for his YouTube videos. The first of this series was crazy, generated a lot of response. Before that he shot videos jumping cars on ski slopes, launching them long distances, and all other kinds of automotive antics... way fun.
It looks shot in multiple takes but I could not even do one trick even with a ton of practice. I would take it for what it is, cheap entertainment.
Kevin