For a long time persons within the Noonan Syndrome population had symptomatology of sensory and social skills that were similar to those who are affected by Autism. Slowly a few individuals were diagnosed and often fought for those diagnostics but told by the school one could not have both.
Research has now caught up and this article is a keeper when trying to get assessments and supports for those with Noonan Syndrome and Autistic tendencies.
Prevalence of Autism Spectrum Disorder Phenomenology in Genetic Disorders: A Systematic Review and Meta-analysis. 9-01-15 The Lancet Psychiatry.
Yes, those with Noonan Syndrome can be on the Autism Spectrum.