I just have to say, WOW.
That's great advice.
Personally, I find that the heavier I go, the less I get up on my toes. The main reason is that I find I control the weight better on my cleans when I pull it as high as I can and just duck under it. When I do that, my feet really don't change position that much. Slightly out, but that's about it.
I'm learning though and I'm a complete novice.
All the best,