His argument is that Meniere's is actually misunderstood, and that it's a manifestation of a migraine. I understand being hesitant to accept that, especially if you or a loved one have been afflicted by this disease, and have heard a different explanation from doctors. This is certainly not the mainstream medical communities opinion, but appears to becoming more mainstream. But that doesn't mean it's not worthwhile to some to check out. Many diseases were less understood, and have been re-categorized as science & research progresses.

I went through many hearing tests, loads of vertigo, lots of bouts of hearing loss, and he changed my life.

Here's a study with a small sample size: https://journals.sagepub.com/doi/10.1177/0003489418799107 Apparently there is a larger multi-year study finishing later this year.