Autistic doesn't equal genius.

Autistic special interest is not about knowing a subject well, it's about fetish\fixation on that subject ; say, I've done a lot of fixing old AfterStep dockapps that don't compile anymore, or programs from the 90s for X11, to reproduce the vibe of using a Unix-like system then. I still haven't written a single Linux or FreeBSD driver. I haven't even written a single Java program. BTW, found the old (Sun-era, judging by the icons and pics there ; old doesn't mean obsolete for me, I'm fine with simple OOP and don't need generics or lambdas or such, I know these are cool) "Java Tutorials" on the Oracle site and realized that those are almost as easy to use to make your own simple applications as TCL documentation, except Java is far more powerful (due to ability to use all the Java libraries around). And now I do know what I want to make, so the next weekend might not go in vain.

There's genius (I dunno, someone like Wernher von Braun), there's autistic (someone like me or your random strange kid, a real life Asakura Yoh), and there's autistic genius (multiply the rareness of both and get the probability of a person being that ; I suppose the kinds of genius to make rare notable achievements are usually both, but not always).