Not to mention the whole savant cliche, not all autistic people are brilliant at certain things, some are fairly average or even below in some cases. Its a spectrum and while there are similar qualities, autistic people can be as different from one another as any other person is to another.
I remember when first reading about this movie and it mentioned how this kid was able to use predator tech, that is when I started getting worried about what kind of film this was going to be.