This is an old idea, it's called controlled grazing, I don't think this guy invented it. Because I remember reading this same idea back in 2009,
the idea is, they would let herd/grazing animals in certain areas and let them poo in the area to bring nutrients to the soil. Which is known around the world, this cadaan guy didn't really invent it lol.
For example, the American plains used to have hundreds of thousands of buffalo, after they were killed, I think so help oppress the American Indians, that area turned into desert.