Possibly, there are other variants of Anderson squats.
The one I had heard was a bit different. Basically, un-rack the weight and do a partial squat where you squat down to a depth such that the barbell touches the pins set at a pre-determined height, and then squat back up - the bar need not REST on the pins in this variant. Now, you start with the pins set pretty high up, but in each session, you progressively set the pins down until you get to the proper squatting depth.
This allows you to take the load off the rack - and use a load that is well above your squat 1RM when you are starting, since with high pins, it is basically a partial squat in the first few sessions. After a few sessions, when you have run down the rack to the desired depth, this weight is basically your new 1RM.
All in all, this one is almost a squat walkout coupled with progressively deeper partials.