I don't know about that fix, but those button switches are not very hard to clean. They are made with a carbon pad on a rubber diaphragm. Pushing on them causes the pad to bridge two contact strips. The button switches are on a small circuit board that plugs into the main board. The same board is used on each side of the cluster. Cleaning is easy with contact cleaner and an eraser, but re-assembling the switch after the diaphragm is pulled off takes a little careful work. The switches are not intended to be disassembled.
When pulling the cluster bezel, do not follow the factory method of removing the steering wheel. Instead, lower the whole steering column,