Yeah that is great progress! Just like Jack said, the first 20 seconds you are using rotation and then you sort of stiffen up and use more elbow. I’m not sure if you can feel it yourself but you probably do.
One way to work on this is to really think of the pick as traveling INTO the plane of the strings or TOWARDS the guitar body. Rather extremely at first actually. This kind of forces the rotation to happen or at least helps the body exaggerate that motion. After som time this will feel more natural and you don’t have to be so exaggerated anymore.
This is what it kinda looks like when I try.
(And wow, making a smooth acceleration like this was hard in the morning. Have to work on this.)