Unfortunately this is only an excerpt from a longer article and does not offer any answers about what the diet of the ancient past was, or what the diet of the future should be.
I suppose it would have a lot to do with where your ancestors lived geographically. Dairy, Meat, Vegetables, Grains. The healthiest approach to consuming food is trying to keep it as simple as possible. The more we process it the unhealthier it is, although fermentation is an exception.
Edit: after googling, no doubt this is marketing for a new book: https://eatlikeahuman.com