A human baby can't learn to walk by having it demonstrated to them; they actually have to try walking themselves. (Though maybe this would be different if adults were shaped exactly like babies, and babies could understand speech well enough to parse a description of the process of walking.)

Heck, even after we learn to talk and read, we still don't learn to write by having it explained, and only vaguely learn by demonstration. We mostly just learn by generating outputs and having them evaluated by the other NI (sort of like how AlphaGo Zero works.)