This is just mewing and chewing but with extra steps... Don't do his retarded exercises just adopt the tongue posture and chew mastic gum
inb4 mewing is cope, good luck looking bloated 24/7 with hypertrophied buccinators, having your hyoid bone sink down to your balls, slowly watching your face melt downward due to improper support, wearing retainers for the rest of your life, getting sleep apnea and dying at age 50 (this one is probably the least important) and developing jaw joint problems. If you want actual good forward growth then you need to look into appliances (don't do FAGGA) but even with those you need to MEW, BITCH! so do it right now or I'll poison your water supply.
Masseter and temporalis are the most important ones to develop, but mewing already does that. Exercises like these are supplementary. I don't think there are any other muscles in the face that you want to hypertrophy.