I didn’t word that too good. As the axle moves through it’s travel it moves in an arc. It will follow the arc of the ladder bar and the spring with its shorter mounting point would bind if the axle can’t can’t rotate and move about the locating pin.
And don’t forget what Grant said. The ladder bar system effectively acts like a giant anti-roll bar. So the axle housing can’t roll rotate, which isn’t all that bad a thing at launch, but it can cause some issues in the gear changes with a clutch.
