I agree.
That digital communications over such a distance is a) possible b) still effective in controlling Voyager is a marvel (IMO).
That the onboard computer can still be reprogrammed by those communications is somewhat astonishing. That there are digital to analogue converters onboard that can translate the messages to electromechanical devices to steer antennae etc stands as a monument to the depth of forethought and planning applied by the designers and constructors.