That's not what this recent book [1] says, at all. In Ducth, but [2] is a translation of the main point in an interview. As far as I'm aware, this guy is rather far away from snake oil. What is true though is that not all audiologists are caught up yet. Which is a bit weird because I already read about multidisciplinary approach working a couple of years ago IIRC. Which does obviously not mean it works for everyone, but also not 'there is no permanent relief'.
[1] Bart Vinck: Tinnitus, een schaduw van geluid
[2] Can tinnitus disappear completely?
"Absolutely, it happens very often. It's to say: we all hear sounds in our heads, only we don't experience them consciously. After all, the brain forgets sounds that are not relevant, just like I don't feel the glasses I'm wearing now.
"Our brain does nothing but sort out stimuli: this is important, that is not important. Logical too, otherwise we would go crazy with all the stimuli constantly coming in.
"My message is not to learn to live with that beep, but to train your brain to classify that sound as harmless, allowing you to forget about it. Feel free to call it an auditory reset of your brain." What does such a treatment look like?
"It has been proven that a multidisciplinary approach works well. Through an intense therapy bath, we try to reset the brain so that that beep or squawk is no longer threatening: patients receive 20 hours of therapy over four days.
"You also have to find other ways to vent tension and take care of yourself. Physiotherapists and osteopaths additionally work on the physical problems. Our patients often suffer from other psychosomatic complaints: they clench their jaws or have tense neck and shoulder muscles.
"Some 96 percent of our patients report afterwards that the impact of the tinnitus has been greatly reduced. Unfortunately, psychotherapy is barely reimbursed."