[astine]

Your statistics don't support your claim. Non-verbal people can use toilets. People with an IQ less than 85% can learn to use toilets. 'Developmental, neurologic, chromosonal and genetic conditions, includes ADHD and dyslexia, neither of which prevents the autonomous use of toilets.

Also, all three of these studies were conducted either before or shortly after the release of the DSM V, and explicitly use the DSM VI diagnostic criteria for autism.:

"Although new diagnostic criteria became available in 2013, the children under surveillance in 2014 would have grown up primarily under the DSM-IV-TR definitions for ASD, which are prioritized in this report."

You seem to be arguing that the relaxed criteria of the DSM V is invalid because the studies on people diagnosed with the stricter methods suggest a more severe condition. This is circular reasoning.