It's not the autism that does any sort of disabling. If there are some sort of issues that are disabling someone's way to live normally, deal with them, but don't use autism as a label or call it a disease.

There's no "autism" as a "disease" that causes those symptoms.

So what's the issue with non-verbal "autistic" people then? All those people with the same symptoms and presentation, if that's not a disease or better, a disorder, then what is it?

Autism is a condition which cause is not exactly clear, but there are clearly identified symptoms "attached" to the "word/label" "autism". Which is how you define/classify/identify a word, and in this case a disease or a disability if you prefer.

May no parents with autistic children ever read your comment.

I suggest you take a closer to the definition : https://en.m.wikipedia.org/wiki/Autism_spectrum