I say BS.
I went on a diet for 2 months, meat, fat, eggs, cheese and lettuce. Lost 35 lbs, BP is down too.
I’ve been on a high protein, lo carb diet for several years. While I don’t eat grotesque amounts of dairy, cheese and whole milk are a regular part of my diet, and based on casual observation, my height and weight are probably more healthily proportioned than 80-90% of men my age.