Shlansky seems to be high functioning, BUT, and this is important, I think it's been emphasized that he's unquestioningly loyal to Conan, obsequious to an absurd degree, and actively inoffensive within the entertainment industry. He is less an autist and more a sociopath.
*internet pipe in internet mouth, puffing internet smoke*
As long as we're armchairing a diagnosis, I'd like to throw covert narcissism/son of a narcissist out there. Many narcissists are socially withdrawn and mistaken for introverts.
What I find really unpleasant about this guy, is he's demonstrating how my own inability to make eye contact without thinking about it is probably really unsettling for everyone else.