The reason why I asked - I think that they are wrong. I have analysed an endless number of PGA tour golfers' swings and they passively lift the right heel in such a way that the right heel lifts and then tilts towards the target. I cannot think of any reason why the right foot should roll inwards. Also, it's a very minor point because the lifting of the right heel is a passive, secondary phenomenon, that is due to lower body weight shift and hip shift-rotation during the downswing.

Jeff.