Same reason all the other stuff is repeated... it probably worked for a subset of people, possibly due to the Meniere's cohort, and since there is nothing else available, it keeps getting parroted. That is the same reason tinnitus is still broadly tied to anxiety and stress, even though that only applies to some people, and why masking is still promoted, even though it does not work for a lot of us.
In fact, I went through what was possibly one of the most stressful experiences imaginable a few weeks ago, and two things happened. First, that stress did not impact my tinnitus at all. Second, since then, I have been eating terribly, not exercising, skipping all my usual supplements, eating loads of takeaway food, and drinking coffee and beer, and it has not made the slightest bit of difference to my tinnitus. In fact, I have probably had some of my better days.
What does seem to make a difference for me? Aside from how much sleep I get, it appears to be the weather. So realistically, it comes down to air pressure, something I have absolutely no control over. Fun.
The bottom line is that you have to figure out what works for you, what your specific triggers are, and what your exact pathology might be, because this is still a poorly understood condition.
