Even worse -- it may refer to a viral meme -- optimizing angular momentum .
Hmmmm.... you're sort of like Charlie Brown kicking the football with your "angular momentum", Erick. You keep kicking it and you keep winding up on your back.
If you take a look at what they're referring to in the "angular momentum" discussion, it's functionally no different than talking about a "hip twist" (to simplify) in a karate punch. All motion can be described, from some perspective, in terms of angular momentum. To say something is "angular momentum" is to say nothing. Or at the very least, there is no distinction by saying "angular momentum" in terms of "ki" or in terms of football.
The Stanford people did publish one thing that is true and important (I ain't sayin'... you figure it out), but they mis-read the force-vector directions. A little statics analysis would have cleared it up.
Still, I'm glad the study was done. Oh... I should note that the "famous Tai Chi master" they used is a student of Feng Zhiqiang whom Feng treats as his number two because this guy can fight and take challenges when they're made to Feng. But his initial training was in Bajiquan and it's very obvious that he uses the power mechanisms of Baji, rather than Taiji, in his power releases.