I'm not sure if this is valid, but it is something I don't typically see from professionals. You are pretty much forced to change your inclination to the ground in the early backswing to get into a good spot.
Latest swing videos (filmed yesterday morning, just sent to evolvr just now). I haven't made any changes from @Grizvok's video, but I do occasionally make a few swings with that arm change. I am definitely doing what is described there as the amateur style (also, you're a better public speaker than you give yourself credit for).