Nothing wrong with Rotating your Plane Line . I personally use the method he's describing with the Driver when Im hitting up on the ball ....... when I tee the ball forward of low point. I rotate my plane line to the right slightly if I wish to off set the fade tendency.
In regard to Hogan, while his stance line did go from open to closed ...it was not indicative of where his Plane Line was pointing. So, I do not believe Hogan tried to hit intentional straight shots very often and I really doubt he used the geometry as described in the video to do so. Thats a pretty big assumption. Man.
Trackman's measurements are probably spot on but the deductions derived there from are ....how should I say this....less precise. Thats ok though. Its a process right. So what. Ive got absolutely no problem with Trackman or any of those machines.. none , zero. Wish they had a usable $500 version actually.