> The same is true of lots of other biological metrics. Very high cholesterol can indicate a problem. From the normal range down it's not predictive of much unless it is absurdly low. Low IQ probably indicates a neurological problem. Normal and above is... normal

Autism is caused by an excess of the same factors that increase IQ, i.e. general reduction of gene expression. Well, it's harder to say that autism is a "pseudoscientific swindle":

1. https://www.researchgate.net/publication/328734204_A_theory_...

2. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4927579/