This is so wrong at so many levels (sadly quite characteristic of the GA crowd) that I can only suggest reading up on the background and the math of it. Good keywords would be stochastic gradient descent, spin glasses and renormalization groups.
Whether nns have an interpretation as spin systems is completely nonresponsive to the hardness of training them. Ie minimizing "free energy" in spin systems is as NP-hard as minimizing training error in nns.
