It would be as if I wrote a history of the Peloponnesian War and, to support my most controversial points, added footnotes that stated “A manuscript in the Vatican,” or “Private letter to author from anonymous Greek shepherd attesting a stone altar in his field”
And then he follows up his complaints about Woodward making unsupported allegations against Rumsfeld with his own unsupported allegations against Republicans.
What Hanson says here is an example to help make his point. He did not write a book about the Peloponnesian War with insufficient notes.