So we're just ignoring everything else I wrote and fixating on the subjective personal opinion? Ok then.

The name doesn't matter; Autism is nothing like Narcissistic Personality Disorder. The only thing I can see that overlaps at all is maybe communication difficulties; but again, the practical manifestation of these communication difficulties are extremely different.

Autism

Autism, also known as autism spectrum disorder (ASD), is a condition characterized by impairment in social communication and interaction, as well as a need or strong preference for predictability and routine, sensory processing differences, focused interests, or repetitive behaviors.

Narcissistic Personality Disorder

Narcissistic personality disorder (NPD) is a complex and heterogeneous personality disorder characterized by patterns of grandiosity, entitlement, low empathy, and interpersonal difficulties, which can manifest as either grandiose ("thick-skinned") or vulnerable ("thin-skinned") forms.

Grandiose individuals display arrogance, social dominance, and exploitative behaviors, while vulnerable individuals show shame, inferiority, hypersensitivity, and extreme reactions to criticism. NPD often involves impaired emotional empathy, superficial relationships, and difficulty tolerating disagreement.