I would say INTJ too. Ni would not be impaired by his condition and he would still be able to apply logic. I could imagine an INTP being very frustrated by Ne deprivation which the condition would cause.
A man builds. A parasite asks 'Where is my share?'
A man creates. A parasite says, 'What will the neighbors think?'
A man invents. A parasite says, 'Watch out, or you might tread on the toes of God... '
He seems like an extrovert to me. Great sense of humor and kind of exhibitionist. Even if he is in a wheelchair. And his main method of argument are thought experiments and arguing from a rationalist perspective, relying on fundamental rules to prove his point.
Define "Smartest." Intelligence is impossible to gauge. Or you taking about Brain capacity, Ability to learn? Technical Intelligence, Social Intelligence, How much "facts" one knows, How well one understands the "facts." Ability to reason? Ability to explain? The word "Smartest" is too subjective.
The HOW and WHY is EVERYTHING! Look not at behaviors nor even beliefs, but the ideas behind HOW and WHY they are held. Only then are your judgements......somewhat acceptable.
"In my mind, I am free!" - Stephen Hawking
What, or who, created and controls the Universe?
We are liberated by discovery. The Universe is a machine with laws we can understand. Understanding these laws is one of man's greatest achievements. We know not how to break the fixed laws of nature. To make a Universe you need 3 things to mix up in the potion. The first is mass. The second is energy. This makes the Universe a dynamic and endlessly changing place. These first 2 ingredients are 2 sides of the same thing, different manifestations. The third is lots of space. We must then ask where this all came from, how the Big Bang originated that sponaneously generated these elements. How does it all appear out of seemingly nothing? Perhaps the secret lies in negative energy. When the Big Bang spawned positive energy, negative energy came in equal and opposite proportions, filling space, a vast store of negative energy. The Universe stores this energy like a cosmic battery. In the quantum world, at the very small, particles can materialize out of nothing and then vanish. The Universe before it began once existed as a small point at this scale. Perhaps its possible then that nothing caused the Big Bang. Time itself comes to a stop inside the singularity of a black hole, meaning when the Universe began as a singularity, time began when the Universe began, originating with a cause outside our time continuum. This means there was no time for a Creator to design the Universe, unless he exists beyond it.
The short answer is very likely not. Although he is known for his intelligence, and he no doubt is massively so, there are other factors beyond his intelligence that will have attributed to his status in the public eye. There are sure to be more intelligent, less public geniuses out there.