You cannot lower the stress of my younger cat. It is absolutely impossible. Something is wrong with him, he is scared of literally everyone other than two people. I'm not even one of the people despite living with him for 13 years now. He, at best, tolerates me being in the same room, but if I approach him, he will bolt. Something in his brain just has him in fight mode all the time.

This certification sounds pretty sus to me. Knowing how to handle animals is something a vet learns in veterinary school.