Ok. I believe the subject of "internal" was raised as something missing from WSL VT. Difficult to answer if unable to identify what the criticism is.
I think the original point (in post #121) was in relation to a WSLVT instructor (Sifu Niels Pivato) who talked about learning in the EWTO and with WSLPBVT, and said that "everybody worked with muscular force", and that this force was "always a crucial criteria for the functionality."
He met with Sergio Iadarola and, it seems, he is now a private student with him.
So the original criticism was that WSLVT (and others, e.g. the EWTO) relied too much on force/strength.