First let me say that his placing presentation before The Fall and representation after is illuminating. Re-presentation creates a space between us and Nature, allowing the possibility of error and anxiety, since it allows us to compare any disparity between our personal experience and surrounding Nature. Yes, there is harmony in the sense that without re-presentation, there can be no awareness of any disparity between one's experience, especially one's desires, and Nature. First of all, we have no empirical evidence for human activity before or after the Fall, so either his claim is rank speculation or he is using the myth only to demonstrate the difference between presentation and representation as human functions. If the latter, then his claim seems simply false.
Representation is what makes human behavior uniquely flexible in the animal kingdom.
Representation allows any organism to change behavior in light of its expectations about the environment. Mankind's dramatically greater representational abilities has made it dramatically more flexible. For example, the law to drive on the right side of the road doesn't just limit my options, it allows me greater flexibility of mobility than I could have without it. A Cognitive Theory of Consciousness. Psychological Investigations of Unconscious Perception.