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The lower you go on the spectrum the higher the chances for comorbidity for a lot of other conditions, mitochondrial and metabolic syndrome, fragile x chromosome, gastrointestinal diseases and many many more horrific things."
Or the greater the likelihood that the autism symptoms are caused by one of these conditions as opposed to it being a primary condition. Fragile-x in particular is a genetic condition known for its physical and mental effects, much like like prader-willi syndrome or down syndrome. It's just as likely that effects from these conditions are being misdiagnosed as autism.
Your post seems confused more generally, though. What clinicians are diagnosing with ASD is a cluster of symptoms, not a specific syndrome. Symptoms can have multiple etiologies and that would still be useful clinically. A cold is treated similarly regardless of the exact viral strain causing the infection.
That a particular person doesn't have to deal with anal leakage is not an argument that they don't have a different condition.
"As an anecdotal evidence I managed to get myself diagnosed on the spectrum in the UK I went to an official diagnosis center and had sessions with an "occupational therapist", at no point have I ever seen a doctor not to mention a neurologist. As morbid as it sound I have that framed just by my ordained minister license which I got despite being Jewish."
If I was willing to lie to a therapist, I could probably get diagnosed with depression, anxiety, bipolar disorder, or any of a large number of disorders, but the presence of malingering creeps doesn't disprove the existence of those conditions.