Earlier quoted context omitted.
It's model of a humanoid robot. It's not a model of a human.
A model of a model of X is also a model of X. It absolutely is a very simple model of human walking. You’re just using „model“ in a very narrow sense that excludes many things that are commonly called models.
AI, in it current state, is not good enough to serve as substitute for human, or human brain, but good enough to serve as substitute of human level intelligence. At this point, we are able to model brain of a fly.
It looks like you are confused by similarity of scheme, model, and similarity.
A model needs a map to transfer knowledge in both directions: from a real thing to a model, and from the model to the real thing, while in scheme, knowledge is transferred in one direction: from a real thing to a scheme. They toy humanoid robot is just a schematic representation of a real human.
Moreover, similar things are not models of each other. Apes are not models of humans and vice versa.