It's not a side kick. Technically he talks about the turning side kick also known as a spin kick in addition to talking about the 360 turning side kick. It's a cool vid - especially for people that don't understand the kicks.
He did well at taekwondo...he actually won some regional tournaments...although rogan is the first to say that taekwondo is not the most useful martial art for real fighting....still clearly its better then nothing..and that kick is definitly useful..he also wrestled in highschool and does BJJ with 10th planet..im sure he could beat up more then 90 percent if not higher of the men aged 18-45 in this world..