No, this is not true. Indeed, whether they are skimmed, semi-skimmed or full fat, all yogurts contain the same amount of protein.
Yogurt is a beneficial food for health. It is perfectly digestible. It stimulates digestive secretions and reinforces the immune system. It strengthens as well our resistance to infections. It also contributes to the intestinal flora equilibrium.
On the other hand, yogurt should always be refrigerated. Being good and nutritious, it makes a great snack, whether in its natural form or with the addition of a tablespoon of cereals, granola, dried fruits or some nuts or almonds.