Unfortunately his logic is flawed. I commented on the video.
In the 3rd minute, when he demonstrated “in line” with the face balanced putter, yes it did not twist. Why not? Well, because he held it plumb/ vertical/ straight up and down.
Had he swung it in the playing angle (lie angle), it would have flopped open. Which is what the revealer shows.
I had high hopes for a solid video, and have no problem with someone concluding that they are not for everyone. But that kind of misunderstanding just ruins the credibility.
Most days it seems that no one in the golf media and teaching establishment understands the basic physics involved. Sigh.