What you say is true, but that is not what the article argues is the most important thing about it.
There are books where you can learn physics and math, and while they aren't free but neither is the computer you need to look at his videos...
I would say he hits the sweet spot between 'inanimate book' and 'personal teacher' pretty much dead on.
Computers and internet connections reach places on the planet where very few physics books go, and embody potentially every book ever written + all the free content available out there.
He doesn't have to be 'outstanding' or even 'great' to have an enormous impact on the world.