Stephen Hawking didn’t achieve the things he did ‘despite’ his disability. He didn’t ‘overcome’ them in order to achieve what he did. He had a physical disability. He did physics. The two aren’t mutually exclusive. Heck, as the fucking ableist mess of an article Buzzfeed posted said, he himself said "My disabilities have not been a significant handicap in my field, which is theoretical physics. Indeed, they have helped me in a way by shielding me from lecturing and administrative work that I would otherwise have been involved in.” 

They also included a quote from another physicist that says “He thinks about the universe differently, due to his physical disability. That enabled him to make discoveries that no one else could make. And he has. They have shaken the foundations of physics.”