This is a rare example to see how not to practice the Taiji ruler (chih). Usually, practitioners conceal their movements with their clothes and it can be difficult to see if "they got it" or "they don't". In this case one can see everything he isn't doing and should be. He goes into a great deal of academic information about the exercises while missing even the most basic of correct body mechanics that would bring about (some of) the claims he's making for the exercises. The comments suggest he is affiliated with Mr. Mace.