i dunno what "autistic" exactly means because in some cases, the more severe, it is caused by an autoimmune reaction that causes constant compression on the brain from swelling, sometimes there is associated general immune problems like one guy who lived nearby my mother he lacked adequate gamma globulin production and had to regularly get injections

i think that the inability to lie is more likely tied to attentional disorders if it's a "disease", since lying requires restraining the impulse to speak the first thing, which is usually the truth