It seems you substantially discount neural plasticity: "...cannot be cured".

IMHO, our understanding of autism, specifically, and neural development of the brain, in general, is rudimentary at best. It's too soon to conclude it's incurable.

I do indeed. Because developmental windows exist. You can take the cat out of the vertical world, but you can't take the vertical world out of the cat. Trying to train them out of it only helps a little - too much damage is already done. The brain has developed a certain way, and you can't un-develop and re-develop it.

There is no consensus that autism is like this, but a lot of evidence points that way.

We'd need at least a generational leap in neuroscience to be able to pull off something like that. It's not a "laws of physics prevent you" level of impossible - we just don't have a clue of how would we even begin approaching something like that.