I don't know how you sideslip but I always seem to end up with TOP rudder so left rudder means right wing down - but maybe you do it differently
Johns post actually says
use the ailerons to the right until the nose stops moving left round the horizon and the aircraft stops rolling left.
If you try this I think you will find the nose does not stop moving left UNTIL you have some right wing down (think about this-if you keep wings level and left rudder you will still turn left. If you are still banked left with left rudder then the nose will swing towards the ground)