While you do have a point that the loudest people are the most heard and that is a problem, I think this statement is inaccurate considering the fact that there is a lot of work out there by nonverbal people, and I think it might be a good idea to look into that work before making sweeping claims like this. There's a book called Typed Words, Loud Voices that's a great place to start.

I would also note that the neurodiversity movement is anti-cure because the entire neurodiversity paradigm is based on rejecting pathology. The word has been co-opted and is used as a synonym for disorder words, but its original intentions were always political. Nick Walker's essay Throwing Away the Master's Tools is a good explainer.

The book Autistic Community and the Neurodiversity Movement is another great one for understanding the history of the movement by activists who have been working within it since the 90's, not all of whom were verbal or "high-functioning" or PhDs. (You might look into Mel Bagg's work, in particular.)

Also interesting is this 2018 survey of 11,000 people by Autistic Not Weird: https://autisticnotweird.com/2018survey/

If you scroll to a section called The Bad Stuff, there's a question about wanting a cure, asked specifically to nonverbal people - about 75% said no.

Of course you are welcome to have this opinion and express it! and of course, ND ppl do not all agree, that would be boring and terrible. but I think you've made some big assumptions here about people who can and do speak for themselves in order to bolster your own argument.