I may have edited too late. He does seem to be an actual fighter and at least for a while under Dave Camarillo, but still very far from being a world champion. Given that he makes a living selling such tricks I think that is a compilation of random training sessions and championship fights intertwined with shots of his face and nothing more.
From what I gather from a short internet search he changed his story repeatedly depending on what sold more. He's either an experienced fighter with multiple world championship wins, or an average guy using his own tricks to win. But his name is not associated with any official leaderboard or championship win as far as I can tell.
As someone who has consistently excelled at amateur martial arts I can guarantee there's no way a world champion gets beaten by some guy pushing him off the lei tai repeatedly even after the same technique was used in every round and with all other opponents. I could knock out almost any "non-trained" person with a single well placed punch or kick, and if they weren't well placed they would still do some temporarily debilitating damage. Yet whenever I had friendly fights with well trained pros, including ones with good results in international championships but no gold medals, I have no words to describe how inadequate and unprepared I felt.
All I'm saying is that the story is not what it seems. Whether he is an actual pro worthy of a gold medal, or some incredible fluke made him fight severely unprepared opponents I don't know. But he certainly didn't win anything because he tricked the weigh-in (that's standard procedure), or because he pushed opponents off the lei tai round after round, opponent after opponent and none of those world class fighters had any recourse.
This is how a fight would look like [0]. You win that by going to a lower weight class and "pushing" only if you are perfectly able to take the hits anyway and are already good. Tricks will get you from silver to gold, not from peanut butter.
There appears to be some footage of it in this video.
https://www.youtube.com/watch?v=ODoVqXgblyw