Does the guy in OPs statement only eat grass-fed animals? Isn't the source of the grass important? If it is grown in a wild field, maybe it will have all its natural nutrients. But if it is grown as a crop, or on a field under repeated heavy grazing, isn't that just as bad as what is happening to the human crops?

Also, if the guy is going out of his way to only eat the best, most expensive beef, because corn-fed beef is actually bad, why doesn't he do the same thing for fruits and vegetables? You can get "wild grown" vegetables just like you can get wild grazed beef. It just costs more.