As far as I know, Anderson squats involve starting with a weight well above your 1rm and squatting from the pins set around maybe a half squat level, then lowering the pins each week and eventually squatting the weight top-down.
The video is a demonstration of the exercise, do you want to wait 90-120 seconds for him to do another rep? Notice there is no weight on the bar. You can watch some of Josh Bryant’s other videos, he discusses this exercise in his books as well. You are supposed to squat, lower the weight back to the pins, stand up and wait a minute or two, and then set up again and do another rep. The point of using the SSB is that it is easier to set up under it than a straight bar.
I’m starting to think you should follow Wendler’s advice and just not do them. I regret responding.