Front squats are famous for stretching the shit out of the fibular head ligaments. The mechanism of this injury is pretty obvious -- if you bounce out of the bottom of the front squat with loose glutes and adductors, the knee slams closed and the compression on the posterior side of the joint mashes the proximal fibula anterior, thus inflaming the ligament. Takes about 4 weeks to settle down once your front squat form is corrected. All the ART guy is doing is keeping it aggravated. All the foam rolling is doing is keeping it aggravated while making you feel like you're Doing Something.
One thing you might try: cut a knee wrap in half and wrap below the patella, around the tibial tuberosity and the fibular head. Might help stabilize it while you're healing up.