I can already squat a lot of weight, will this program be too easy?

This program is not designed to improve your squat PR, but rather improve your total range of motion.  So if your legs are already quite strong you could use this routine in place of your usual squat warmup to unlock some additional range for deeper barbell squats.

And if you’re already doing barbell training, you might benefit from the Overhead Squat Add-On which will improve your overhead mobility to improve your technique of this Olympic lift.