He feels he is able to make things happen in his body via his thoughts affecting the quantum energy field, that place “before things pop into reality.” Is he correct?

He is partly correct. Those phenomena in the interaction with the zero point energy field do take place as a consequence of consciousness, but it is the consciousness of the lower levels of his own mind rather than the conscious thoughts applying the imagery exercise who are doing so. The imagery and the intention of its application are a message to the other levels of the mind and body-mind, so to speak. In terms of consciousness interacting with consciousness, the subsequent steps involved changes at a quantum level for what takes place in the body that becomes experienced as bodily symptoms or their absence.