I dont see anything internal going on there, maybe I need better goggles. Lots of knee walking. There's a diagram that looks cool, but diagrams are easy to find, and I dont understand the dialogue , so it could be that the exercises shown could be used as internal training, but I dont see it.
Of course someone is going to say that's their uncle and who am I to say what. From where I stand , I dont see it either.
The diagram is even possibly illustrating a postural defect, with a helpful visualization to reinforce the postural defect (hyperextension of lower back causing belly to protrude and bleed force down the front) with mental imagery, which is what he is doing actively in that first cutting exercise even. YMMV.