First of all about the IQ thing, IQ is more than just math skills, he may be good at math and physics (at least ability, he doesn't have the experience as major physicists however) but he may not be very good at other subjects.
Also I don't really know much about him, but the video on the speed of light thing really doesn't make much sense, since it isn't just a theoretical idea that c is the upper speed limit, its been verified by experiments time and time and time again in particle accelerators.
But that being said he does look like he could make a very good theoretical physicist eventually.
(and in case you are wondering I'm actually majoring in physics in university so I did understand what he was talking about in the videos, and it sounds fairly good)