I think the issue here is the definition of a disability changes depending on the context.
And disability does not necessarily means not being able at all, especially with this type of conditions.
There are disabilities that are very clear to define (eg. Paraplegia due to trauma, where the loss of function is easy to assess, and where improvement, if any, is slow and progressive, so that regain of function is also easy to assess), and other conditions where the disability is less easy to assess.
Also, indeed, a disability can be overcome. And when it is, it's understandable that the person does not consider it a disability anymore (although technically, it is still here, but overcoming it is like gaining an extra ability, putting back the ability/disability balance to neutral so to speak).
That's how I feel with dyslexia. It threatened badly my early education, but the tactics I found to work around it actually helped me with learning other languages. But, I still struggle with dyslexia, especially in my first language. It could have been a huge handicap, but it ended up being sort of neutral in the balance advantages/disadvantages.
However, with autism, and in my specific case, the advantages or extra abilities are inexistant. If I really want to search for some, it may have been helpful to get a doctorate even if I have a super super defective memory, because I'm naturally very analytic from as long as I can remember, and I've seen that linked to autism. But I can't use my degree because I can't work in a team...
Ultimately, it's to each to decide what constitutes a disability.