Architect Fernando Pages Ruiz’s Book: Building an Affordable House

I just read a review of the book “A Pretty Good House” and the author mentioned another book by architect Fernando pages Ruiz called Building an Affordable House. I’d never heard of it. Anyone read it?
https://www.amazon.ca/Building-Affordable-House-High-Value-Construction/dp/1561585963
He has a Facebook page as well.
https://www.facebook.com/BuildingAffordable/
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Here's a great interview with Mr. Ruiz.
https://www.youtube.com/watch?v=ulYT67e1Vwg&t=53s
His website.
https://www.buildingaffordable.com/
I'll add this to stir up some comments. On the author's page of Mr. Ruiz's website he states that "I still build for about $45 a square foot" (end of paragraph one). I'm waiting to receive his book to see how this is possible.
https://www.buildingaffordable.com/author/
I just finished building a house in Washington, DC, and the pre-construction soft costs -- architect, civil engineer, structural engineer, mechanical engineer, landscape architect, arborist and insurance -- were $50 per square foot. That includes property taxes paid on the land during construction but doesn't include any site prep.