Is part of this technique the reverberation that is always present when he gives a speech?
Everything he does contributes to the effectiveness of the technique...the sound reverberation, the halo lighting, the overwhelming use of messianic iconography, the Berlin speech at the Victory Column (he wanted Brandenberg Gate), the Pergamon Altar (Throne of Satan) setting in Denver, the actually language of his speeches (vague utopian terminology), etc, etc...
Yes, the cadences. It is the reason that the marching orders are used in boot camp to get recruits to follow orders. It’s also the reson that rap music has such an influence over its listeners.