Good morning,
I found it hard to believe also. It only works if the conduit is routed with some curves. If it were completely straight, it would not work.
I unscrewed the throttle out of one of my dirt bikes and held the throttle plunger when twisting the grip to convince myself. It made sense though because that is why we have to clamp the conduit in applications where the cable pulls something.
Thank you,
Scooter