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We've had this pine for a number of years now.
This fall I noticed a few places that looked like it was backbudding. And now it is quite obvious that that is what has happened. How is this possible? Have any of you seen something like this??

It happens all the time in my care and environment. It is also necesary to create a tree as the one you have. Without backbudding It would not have that tight internodes.

so obviously I want to cut back to the buds closer to the trunk.. my inclination is to wait until the tree goes somewhat dormant again so that there isn't?
as much sap flow. What do you think??

Yes. That is how bonsai is created. Create backbudding and cut back.

If I know I want to cut back I let it go a few years to get a proper branch before doing so. Late winter to early spring is the best time.

I cannot coment if I would cut back or just develop one more branch in this case. Do not know where it is or how it would impact the overall canopy. However, the full picture shows a mature well balanced tree, so I would urge you to think many times if it is the right decition. The fact that you have a backbud does not mean it must be cut back.