Well if you are compensating for twist the way Pro-Tools suggests, you simply do the same compensation on each of the bends. When using a plane of bend bracket, you usually always bend from one end to the other, feeding the tube in one direction and never flipping. So for each bend you are able to compensate for twist by starting with the tube twisted in the opposite direction. If you like to bend from the center out, where you flip the tube, you're going to have a hard time effectively using a plane of bend bracket.
I think the problem with the method described in the Pro-Tools link is that if the twist depends on bend angle (i.e. there is more twist for a 90 deg bend than for a 45deg bend), you would also have to factor that into your compensation. The root cause of the twisting is not being addressed, which as I understand it usually has more to do with the angle of the pins that keep the die and follower block on plane with eachother.