I've been IF for several years now (for whatever good it's done me!), sometimes very strictly and sometimes casually, and I've noticed no correlation whatsoever to my tinnitus. I do buy that anything that really reduces inflammation or anything like that could help, because my tinnitus is definitely correlated to ear congestion and sinus inflammation (but it's always there at some level no matter what).
Basically, my understanding is that the human body is, for basic evolutionary reasons, really efficient at dealing with glutamate.