I think this is web-boosterism. Consider another candidate for greatest library in history of the world: the British Library. 200 million items, most of them available to read at 45 minutes notice, centrally located in one of the worlds most important cities.
I'm bet that 99% of what is on this page is in the BL. Is 99% of what is in the BL on the web?
EDIT: For context, here is some of the stuff in the BL: https://en.wikipedia.org/wiki/British_Library#Highlights_of_...