[Mike O]

My highlighting. Sorry if you misunderstood my post.

From my comments, it should be understood that the sweetspot and pp3 can remain on-plane (square plane line tracing) and yet in a different plane to the left arm only with a bent left wrist. (assuming that the clubface has not rolled away from the plane prior to left wrist uncock.) At least that is the way it seems to me from Matthew's videos and previous posts.

Is this wrong?

If the logic is that the left wrist has to be bent and on the clubshaft plane for a sequenced release to occur in a manner that maintains an on plane clubshaft motion- then yes that is wrong. The on plane motion of the clubshaft is a resultant vector quantity- composed of many divergent and off-setting vectors of which the left wrist "uncocking" would be just one of those.