That was Yorda's point- they function in many ways as life, but fail to meet the general criteria for life, and as such, aren't classified as life. He, however, does not make the distinction. It's like saying "I think some dogs are mean." And you say, "what sorts of dogs?" "Oh, I don't know," I reply, "I think dobermans can be mean." And you say "No, Dobermans are not mean, try again."