@normanosk It should not be a problem. In fact, many men need relief from urinary symptoms via various procedures before radiation, since radiation itself can cause swelling and urinary blockage. So in that sense, he is in a better position now to receive treatment.
Also, radiation to the lymph nodes only would be counterproductive since the cancer is coming from the prostate gland itself.
Not targeting the gland would be a waste of time since cancer cells would invariably migrate back to the nodes and other parts of the body.
Phil