As you can't correct for tracking errors in the turns
You can't if you are inside the hold, you can if you are outside the hold.
I think overall, everybody seems to have a different way of doing holds and this must be extremely confusing for Juicy Lucy! The Thom method is a simplified hold technique. The 2xdrift is valid under some circunstances depending on the conditions on the day. I suspect that is the case. Juicy just needs to re-clarify with the instructor to get that straight and take advice on how to do the hold from just the one person - her instructor