Fascists aren't telling you what they actually believe to be true, they don't care what's true and think you're weak for caring about something so unimportant. They're telling you what would have to be true to justify what they're already planning to do.
They have no loyalty to an argument. They don't use an argument to state their position. They will flip flop on them at any given turn as long as they feel like they won. Power and cruelty is their only motivation. They couldn't care less about anything else.