I don't think such individuals are above typing. However, it must be taken into consideration that typing such a person does not make them a normal or typical person of that type. Else, we start using the tool to demonize people of certain type with claims that could be something akin to "ENTJs are all evil." (Just through ENTJ out there, it could be any type).
Also, individuals on the autism spectrum can also fit into MBTI and Enneagram types the same as anyone else. Now, I suppose it would be very hard to tell for someone who is very severely autistic. But, people on the spectrum can encompass a lot of different types. It's not all just INTx types (which I've seen people attribute it to, which is kind of like saying all ExxPs have ADHD).
Of course, it is important to note that autism does not lead someone to be a murderer. The vast majority of autistic people, even if they do have issues with empathy- which is only one possible manifestation and does not make them sociopaths/psychopaths- are just as likely to hurt someone as any other random person not on the spectrum. I'm not saying that it's never a contributing factor, but the vast majority of people on the spectrum are not violent. Heck, if you told me that my three Fi-dom friends the spectrum committed violent atrocities, I'd flat out call you crazy because I know them and how it would deeply contradict the personal values they live by. (Albeit, I'd seriously question the legitimacy of such a claim about any of my friends, regardless if they're on the spectrum).
Sorry that might be a bit ranty, but I tend to get that way about these sort of issues.