I'm convinced that Damon Baehrel is a semi-fake restaurant. Like, it's real, but doesn't actually take reservations or serve real guests, and the owner/chef lies about everything in order to seem more mysterious.
This article from 2016 lays out the case.
So I don't think it's a particularly good example of fine dining, as it's doing a lot of things different from a normal restaurant that is open to members of the public.
Mountain Dew was originally invented as a moonshine mixer, so that's just returning to its roots.