I was confused by this too.

The blog is called The History of FoxPro. The Ratliff interview is just one post of a number in the pre-history of FoxPro detailing the rise of dBase. Many of the others pertain to FoxPro.

http://www.foxprohistory.org/tableofcontents.htm

I agree with you about the FoxTales book. It was a great read.