Soldato
It just sounds dangerous, tbh. It recommends doing 20 squats at your 12 squat limit, which is just asking for **** form.
You may make good gains, but only so long as you don't snap your spine in half and nuke your lumber from orbit.
I guess it depends how far you go.. if you feel pain coming from you spine etc stop! I can comfortably squat 60kg for 20 reps.. at a push 80-90kg should be possible