From wikipedia, about the author: 'He is an HIV/AIDS denialist, supports the 9/11 Truth movement, and supports a specific John F. Kennedy assassination conspiracy theory.[2] He also believes that the Biblical Noah's Ark is located at the Durupınar site in Turkey.[6]'.
I would recommend learning from different sources.
That's an Ad hominem attack by Media Matters and doesn't effect my strong recommendation that this book explains the banking system and how the federal reserve functions.