I looked those videos up and the 1p wavedash was indeed great but they don't show camera of their hands doing it. I think that is the point of this video here, to demonstrate visually how to perform these techniques.
@RaishinX While it is true that the MyoungShin stick does not use a gate, the restrictor is still designed in a square. Each switch makes a right angle with eachother trapping the stick in a square. Your d/f's are still easy to hit unlike some US sticks with circle gate.
02:36 MainStreetRyu (二代目メンストリュウ) is unique. The person who translated before said the visual was also self-explanatory but much different from most peoples styles.
AC uploaded this once but them removed it. I remember a little bit of what someone roughly translated. Alot of the visual is self explanatory. 01:20 Yamada (山田) basically says to keep side of hand on base, dont move your wrist wildly for the movement but instead use fingers and thumb to control stick. 01:50 Zekusu (ゼクス) is pretty much self-explanatory. Rebeljins video uses zekusu same style for 2p WD and I use same style for my 1p WD video so those may give more insight.