Originally Posted by kitarpyar
Possibly, there are other variants of Anderson squats.
Yep, there are. The one you describe is a modern variation of what Anderson did, it's more suited to a modern gym setting.
What Anderson actually did was to dig a hole in his garden to the point where he could stand in it and do a very high partial Squat with a lot of weight. When he had mastered that, he would throw in some more soil (thereby increasing the ROM) and master that height. He would continue to do so over weeks 'till he was actually squatting the weight.
At which point, I imagine someone might ask him to stop digging any further holes!