Great post! I went back and re-watched that moment just now, and I realize Teemu and I are talking about two different things. What you’re demonstrating is the same as what Teemu is demonstrating. For lack of a better term, and just so I can keep these movements separate in my mind, it’s what I call “lean”. It’s the third dimension of pick geometry.
We have edge picking, which is one axis. Then we have pickslanting, another axis. And the remaining one, where the pick tilts either toward the bridge or toward the headstock, would be lean. With all these dimensions, I consider the point of the pick, where it meets the string, as the vertex of the movement. So imagine that the point is stuck on the string and can’t move. Now lean the pick toward the bridge - that’s bridge “lean”. Now lean it toward the headstock - that’s headstock “lean”. It’s clear in my re-watch that this is what Teemu is talking about, and what you are also pointing out, and that I missed what he was saying!
The thing I mention in the interview is the angle the forearm makes as it approaches the strings. This is what I call “approach angle”. It is essentially the same plane as edge picking, just done with the arm instead of the wrist or fingers. Most people approach between maybe 10-11 o’clock with respect to the guitar body / strings.
All these axes are related of course, but what you and Teemu are getting at here is created when you rest the right side of the palm on the bridge - that causes the bridge-ward lean. It is possible that this related to making the pick/string contact smoother just given the way most people’s arms rest on the guitar. Anyone who is having issues with this care to test, let us know.
Great catch!