I saw it, its true. He went from full retard to full advance and the timing didn't change from 19mm BTDC. The timing did seem to be really jumpy too. Really weird but I can't say it hasn't also happen to me before as well. Its really strange because it you physically move the stator plate, you are moving when the points open on the cam no buts about it, there should be no possible way the timing shouldn't change.
Are you sure you had the arrow pointing the right way on the sensor on the timing light?