A student of the person in the second clip has said that they are aware the technique is being done wrong.... or, rather, they said "well, that is from 1994 so it is a bit old"
To me, this seems to say "we were trying to incorporate some stuff we didn't really understand very well into what we were doing"
CROSS TRAINING IS ADMIRABLE.... ie go out and find a BJJ, Judo, Sambo or wrestling coach and learn the techniques correctly
Do NOT try and "wing it", doing the technique incorrectly and then passing it on to students that way....
Or, worst of all, try and tell people it has been part of Wing Chun all along