That has nothing to do with what I said.Tinnitus causes stress. Stress causes fight or flight response, which can cause tinnitus to be worse. It also is harder to habituate to something that is causing immediate stress and anxiety. This includes chronic pain as well.
By using CBT it reduces stress and reduces the increased tinnitus caused by stress. It also allows the brain to habituate better.
this makes tinnitus less bothersome and less intrusive over time because your brain can, to a certain extend, tune it out. This isn't a cure, but it gives people the ability to live their life on a better level than previously.
habituation doesn't fix or solve the problem, but it does exist and can help some people deal with it.
Also, having less stress can strengthen your immune system and help you fight cancer. Therefore according to your logic CBT is treatment for cancer.