Don't believe Trump lives in a world where "truth" and "lie" has no meaning. He doesn't lie to deceive. If that was his goal his lies would be more carefully crafted. He lies as a demonstration of power and test of obedience. He is absolutely saying things that no one believes are true, just to make his toadies nod along, just to ensure no one yet feels brave enough to question his pronouncements.
If none are willing to contradict his statements, none will hesitate to carry out his orders.