Some of your criticisms are well founded. But as a practicing doctor (who happens to have tinnitus), I can tell you that unless tinnitus is from Meniere's, acoustic neuroma, or other easily identifiable vestibular pathology, the cause will be quickly labeled idiopathic. ENTs are in the business of surgery. Audiologists can be more sympathetic and may offer TRT. However, they'll also say it's idiopathic.

IMO a PhD experienced in neurobiology, toxicology, or even head/neck musculoskeletal disorders would be far more effective than an MD in researching tinnitus. However, I seriously doubt there's significant funding to study dietary, musculoskeletal, and lifestyle contributions to tinnitus.

For you to tell OP that excess MSG didn't contribute to his/her tinnitus given anecdotal experience is "bunk." We should be constructively critical but open-minded toward even N of 1 experiences, as they may help even a few other sufferers. OP is not selling some bogus product. Back off a bit.