I can definitely see how his approach could help people as it reduces stress and anxiety. I honestly think he's genuine. But there's a difference between saying "I found this treatment which tremendously helped me with my tinnitus and it might help you as well" and "I found the cure for chronic tinnitus, everyone can get rid of tinnitus".
Now, as I said, I truly believe that he's genuine and simply wants to help people with tinnitus. I don't think he's trying to scam people because he seems truly convinced that his approach can cure everyone.
Do I think that massages, seeing a therapist, relaxation, meditation, etc. can help with tinnitus? Definitely. Do I think that this could cure everyone? No.
Also, most of the people saying that his videos have helped them seem to be people who have had tinnitus for less than a year. So it becomes a question of correlation or causation. Most people eventually habituate without any help, many people also notice a reduction in volume or a more neutral emotional reaction towards their tinnitus with time. It's hard to say whether this is due to his treatment or simply the natural healing process. However, if his videos help you or if his recommended treatment helps you then that's all that matters.
Personally, I still think it's a huge claim to say that you have found the cure for chronic tinnitus. Sometimes a part of me still hopes that my tinnitus could reduce in volume. Maybe I really just have to calm my nervous system? I'm doing yoga, meditating, I've tried acupuncture, massages, craniosacral therapy, had CBT sessions with a therapist but none of them reduced my tinnitus (though they definitely helped me to relax and to deal better with stress and anxiety).