All of these should be easy for anyone who has trained a little like he says. Some I dont think are demonstrating the thing he says they are (winding) but many are the most basic things.
I think the problem with this video is that it is showing results of someone who has trained... he says this. But you can tell from even the students in the video that these things will be chased by them as a goal not a result.
Maybe these trick would be worth checking once a year?
The 'jin' is not structure" for instance, what he is doing is fine, it is very easy and very basic... but has inherent problems if it is focused on.
I have seen many demos like this where someone holds a point of contact under moderate pressure still and moves their body around behind it, in fact I remember mikhail ryabko showing just this in a seminar I attended. But as force increases (as it does in a fight) this concept breaks down and one side of the body empties out and becomes light as the line to the earth begins to deal with increasing forces. This can be seen in the most staunch advocates of this approach videos, and I have yet to see anything, from anywhere, where this is not the case.
This basic idea of handling load should be moved beyond as fast as possible, once connection is achieved imo. But as the video quite rightly points out should be very easy for anyone with a bit if training
I am glad he calls it a trick in the video.
The belly moves, what he shows has nothing to do with the Dantian. The Dantian is a small spot inside of the body, if it moves or not can not be shown from outside. Probably it moves together with the external movements, but it’s certainly not the center of the movement.
There are long established IMA traditions that would disagree with you. I can think of a number of tai chi, Xing yi, xinyi and ba gua lines that maintain both the 'rotation of Dan tien' (belly, pelvic floor, diaphram and lumbar spine egg etc co-ordinate in movement) and the 'single point' models.
Overall, the words at the start are more important than what is shown. He says openly that anyone with training you showed this too would look a big confused and a bit 'yeh... and so what???' ... maybe that's how we should be viewing it.
Good video for that nugget if nothing else.
Thanks