Regarding your point B, the current US government guidelines that the current article rails against as not being scientific enough actually say:
> The core recommendations of the Guidelines state that a healthy diet for all Americans should include vegetables, fruits, grains (half of which should be whole grains), low or non-fat dairy, and a variety of protein foods, including seafood, lean meats and poultry, eggs, legumes (beans and peas), and nuts, seeds, and soy products. Further, Americans are told to keep saturated fat content below 10% of calories (why the DGA recommends lean meat and low or non-fat dairy), added sugars below 10% of calories, and salt below 2300mg per day.
So they don't seem particularly out of line with the diet of your bushmen:
> The Bushmen are hunter-gatherers, 75% of their diet consists of vegetable, including berries, walnuts, roots and melons, that are mainly harvested by women; while the remaining 25% is made up of meat that is hunted by men who hunt, using poisoned arrows and spears.
(It's not clear how those percentages are measured, volume, weight, calories?)
And the general advice around the world is "eat less red meat, especially processed meat" which seems remarkably tame compared with the anti-meat jihad that some people seem to think is occuring.
e.g. https://www.nhs.uk/live-well/eat-well/food-types/meat-nutrit...
> Meat is a good source of protein, vitamins and minerals in your diet. However, if you currently eat more than 90g (cooked weight) of red or processed meat a day, the Department of Health and Social Care advises that you cut down to 70g.