It can't be more clear.
Narcissists often exhibit authoritarian tendencies because their core traits—grandiosity, entitlement, need for control, lack of empathy, and belief in their own superiority—align perfectly with authoritarian ideals, leading them to seek absolute power, disregard rules, exploit others, and demand unquestioning loyalty, creating a dynamic where they dominate rather than serve. This can manifest in leaders who crush dissent, dismantle democratic norms, and believe rules don't apply to them, making them prone to "narcissistic authoritarianism".