I will address your last line. Autism is a difference in the brain that lasts from birth, thus it’s permanent. Personality disorders are generally not diagnosed until age 18 because your personality is still forming in childhood. Many PDs can go away with treatment, some simply as time passes.
ELI5: for treatment, with autism you learn how to live with your different brain. Personality disorder treatment works on changing the brain.
Edit: wording and spelling
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