This description is not even wrong. It's random misunderstandings combined.

There's a list of autism symptoms used diagnostically. The list above is nowhere even close. Neither High IQ is used as a diagnostic of autism (and you can have autism and low IQ), nor ADHD (hell, until recently it was the opposite: doctors used to believe you can't have both ADHD and autism), nor bipolar disorder (at best a comorbidity).

I'll give you "eye sensitivity" (sensory sensitivity), which is one of the diagnostic symptoms.

As for loneliness, that is a second order effect under certain social circumstances, not a psysiological result of autism. Might as well consider bullying a symptom.

> and you can have autism and low IQ

In fact, various studies have shown that most people with ASD have a below average IQ.

> There's no underlying nexus between the list of symptoms beyond statistical correlation

Correlation is correlated with meaning, so what are you saying

Correlation is not causation.

Ok—you seemed to have missed the main point. If people react to xyz, it doesn't matter if xyz is actually occurring. In fact the only thing that matters is peoples' reactions.

Often there is a diagnosis of autism and of the comorbidities you mentioned.

And there is not always only a correlation and not a causation. People with autism, adhd etc. have a higher risk for depression and social anxiety, often induced by the experience of living with these conditions.