"Intelligence is not about knowing stuff"
Actually, I believe that to be very very wrong. There was a series on the BBC recently about the human brain that had some neat 3D graphics representing the kind of processing that goes on when we do stuff. When you open your eyes, a large amount of data is sent to the visual cortex for processing. But... these signals are dwarfed by what happens afterwards. Massive floods of data are sent from the cortex (far exceeding the scale of the incoming data) so that the brain can pattern match and build a model of the world. Almost all of what you 'see' in your mind is the modelling of stuff you've seen many times before, and it needs a vast amount of prior knowledge in order to do that.
You could call that introspection of a sort. Visual intelligence, at least, is very much about 'knowing stuff'.