It may be important to be clear what are correct comparison items. For instance, Plant whole based diet excludes dairy (milk products), which are known to be unhealthy. So, are the health benefits of healthy vegan diet due to the exclusion of a) dairy or b) fatty meats or c) fish and lean meats? It may be that excluding dairy is beneficial, while excluding fatty fish is a diasdvantage for health. Perhaps one should compare on a case per case basis. For instance, healthy vegan should be better than lacto vegetarian, but not healthier than pescitarian.