Both my parents were raised on dairy farms (cow) and I almost want to say that whatever the guide told you is a load of crap, probably to try to sound better to those who know nothing about cows.
Lambs, kids, and calves CAN definitely scour from milk replacer/powder forms, but from their own milk I've never heard of it happening. Many small farmers/cow owners still raise their calves with the mother.. engorging themselves on milk seems unlikely, no matter how much it produced.
As 51/2Farm said, it is much cheaper for farmers to raise their animals on powdered milk than real milk that they would otherwise sell. I'm guessing that's why you were told that.
I only have experience with Nubians, Alpines, and Saanens as well. Nubians are a favorite because of the colors and ears, as well as the high butterfat content.