Yes, I believe so. Although a lot of PWS don't like to term it a disability, recognizing that my stutter is a disability has helped me start my journey to come to terms with it. It has helped me a lot. Because disability doesn't have to be negative. It is not. Overall, from what I have observed in the PWS community, it boils down to the individual whether they want to recognize it as a disability or not. In legal terms, it depends from country to country.