[Bagger Lance]

If Homer’s statement above is correct then if, at the same time as you are using your Right Arm and Shoulder, you use anything else to assist in powering your stroke you must, by definition, be pushing and pulling at the same time. True or false?

For the most part, we are talking about the moment of truth...impact.

It can be argued that there several things that are pushed and pulled at the same time in the golf stroke. For instance, to pull from the ground up do you push the feet into the ground?

Back to impact...

6B nailed it above, but to add to his comments.
If you you are swinging and decide to override CF, then the stroke becomes a "hit" and if you haven't prepared your machine for hit characteristics such as angled hinging, clubface closing/layback and crossline delivery then you missed the shot.

If you are set up for hitting and decide during the stroke to pull with the pivot through impact your rhythm, clubface alignments and plane will also guarantee a weak/missed shot.

Study the Law of the Flail in 2-K for details.

I'm going to step out on a limb with more food for thought...

In a pure left arm swing, the (pushing) role of the right arm is to maintain or maximize extensor action without overriding centrifugal force. Some can say the the left arm is pulled straight by the right, others can say the right arm pushes the left arm straight. Still others will say, its neither because centrifugal force pulls both arms straight. Extensor action is what it is. It's the third side of the triangle attempting to fully straighten at all times. Homer called it Extensor Action because the use of it is active. Otherwise he would have called it Extensor Motion.

Adding structure with extensor action (an active right arm) will add distance to a swing by allowing resistance to hand deceleration as the accumulators are released to their inline condition. It also reduces clubhead deceleration during the impact collision. In this case, adding extensor action structure will feel like you are pushing through impact, but in reality you are resisting deceleration without overriding centrifugal force. You are maintaining a constant hand speed around the endless belt without disrupting centrifugal throw-out action.

This concept takes us into the "mysterious" realm of the 4-barrel swing. It takes you so close to throw-away that Homer only recommends it for the most skilled players. In other words there is a very fine line between a 4B swing and overriding CF, which turns the swing into a very bad hit.

Sustaaaaiiiinnnnn the laaaaggggggg....