Why is that a downgrade?
Meat and dairy contain the bulk of the saturated fat in the average diet. It's pretty absurd to imagine a diet in which the largest food group is just meat and dairy, but due to the ordering, that almost seems to be implied.
The saturated fat → LDL-C → heart disease relationship has a lot of evidence and history behind it. A very interesting research project if you needed one. I call this advisory a "downgrade" because heart attack and stroke (among other conditions) are both: 1) downstream of saturated fat consumption, and 2) the most prevalent causes of death among people in the developed world.
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Dairy/Meat are both inflammatory and overconsumption contributes to a whole host of medical disease.
Some protein is obviously desirable, but the ratios, like anything else in chemistry/biology, are paramount.
I don't think the USA has a problem with under consumption of meat and dairy. If anything, it has a long standing overconsumption problem.