I'm not aware of any restaurant that claims to be a total replacement for other meals elsewhere.
1) It's a really silly claim, as a restaurant doesn't offer the convenience that people are willing to divide their flavor/food-enjoyment with that Soylent does if you must travel to it.
2) There is little benefit to making claims that can be used against an organization if the claims don't also offer a boost to some other aspect of that organization. "Eat here for every meal" offers little to a restaurant except for the chance to get sued by an unhappy/unhealthy patron.
What happens if you eat the same thing at the same restaurant for every meal and die after a week?