This is an interesting video, but Stephen Pinker makes a statement in it that is analogous to, and just as nonsensical as, the following:
It is not raining outside.
Tom does not know that it is raining outside, as he has not yet looked out the window. [edited to add that last clause]
And I think that the broader point he is making while he makes this error is also pretty much bogus, but that is not quite as clear, and I’ve heard it argued that I am wrong on that.