100% correct. His autism diagnosis will probably be a factor in determining a plea deal, or if this goes to trial, in sentencing, but there is absolutely no way he will be found NGRI, and Heilberg isn't even going to go down that road.
If you guys think Chris is gonna plea NGRI, I want you to go on Google and find news articles about schizophrenics that killed people. Schizophrenia is way more debilitating than the mild inability to tell fantasy from reality thing Chris has, yet the people who commit murders because of it are almost never found NGRI.
Furthermore, NGRI would not reduce his sentencing. The quickest way to get out of confinement is going to be a guilty plea.