I don’t see it. You view Paulsen’s position as a “rejection of the idea that God the Father had a father who then had a father and so on ad infinitum,” but nothing in the excerpts you have quoted seems inconsistent with that notion. Perhaps you are resting on this statement: “There is only one … fount of divinity.” Obviously, Paulsen is attempting to respond to the idea that Mormons are polytheistic — a most grievous sin in the eyes of some so-called Christians. But whether God the Father is Himself part of a larger plan does not seem to be addressed at all by this statement. For our purposes, He is the sole “fount of divinity.” If there are other founts of divinity for other people not within our realm is irrelevant to me, which is why, I suppose, we do not have more information about that possibility.