Correct, moving the serated plates “up” should rotate the torsion plates so that it pushes the trailing arms toward the ground, thereby raising the front ride height.
I suspect that the sway bar is the culprit. Disconnect it, at least where it anchors to the beam and the trailing arms should drop as you raise the car.
If the sway bar, shocks and ride height adjusters are all disconnected and it still doesn’t move, while the car is on stands, push down on the wheels (two people, one on each wheel). They should drop no problem.
Pink MG39549.6265393519