I found it particularly ironic given he specifically used the example of Harry Potter, "a pretty thick book" being only "about 500kb of text", despite the fact

I found it particularly ironic given he specifically used the example of Harry Potter, "a pretty thick book" being only "about 500kb of text", despite the fact that the actually book (the physical object he specifically picks as his metaphor) has pictures at the start of every chapter, not to mention the custom fonts and typesetting. You would need way more than 500kb to represent the actual book.