there is back, there is up and there is in instantly and simultaneously. If he is referring to not lifting your arms that's a choice, the little yellow book does not advocate one pattern over another such as a pattern that lifts the arms over one that does not. Tell jack Nicklaus there is no up in the backswing. To me, no matter what way he is intending to use the word up, to say there is no up in a golfswing contradicts the fact that golf is played on an inclined plane and not a horizontal plane. He demonstrates that standing straight up and swinging around his spine that there is no lifting simply rotating around the spine angle, then therefore when you bend at the waist and continue to simply swing around your spine angle it creates the inclined plane. The fact is though that even if you employ a plane and shoulder turn that does not require any manual lifting of the arms, the club started on the ground and at the top of the swing the club is in the air and not on the ground, therefore it went up.
I think "no up" means no reason to elevate beyond TSP. I think Jack is "across" (w/flying rt elbow), not "up". McHatton also suggests that we create a very long "club" at impact...one that begins at the left foot and ends with the clubhead (he holds the club perpendicular to the ground directly above his head). A swing without EA which culminates in one fully loaded, very long primary lever? I think the image of building the long club provides freedom of movement yet incorporates many important alignments.