I’m not sure I agree with them on Skim milk. The lack of a few vitamans and essential fats (which you get from plenty of other foods) is more than offset by the fewer calories. For those who spend a lot of time in the gym, skim milk is a great way to get a lot of protein without a lot of calories. Right up there with chicken breasts and salmon.
As the article states, the powdered milk added to skim and low-fat milks is very unhealthy.