I wasn't able to view this video, so I can't comment on the video content. However, I have known Chan Pui Sifu for the past 40+ years, during which time I have personally spoken with him at length many times and have seen him demonstrate his expertise with the Wah Lum Praying Mantis Style on many occasions. He is the real deal, and is someone whom I consider to be one of the best martial artists of his generation, regardless of style.