Will someone look closely at this image from the Pilot's Handbook of Aeronautical Knowledge and tell me if the VSI diagram is incorrect? I'm probably just tired and not seeing it right, but to me the VSI needle would indicate a decent when the aircraft is actually climbing.

As the aircraft altitude increases, the pressure inside the bellows decreases (it's connected to static pressure). The instrument case's pressure should be higher than that of the bellows in a climb so the bellows should collapse right? If my logic is correct then the mechanical linkages in this image appear to be incorrect. What do you think?