I applaud the author for his tenacity. There is no doubt that kind of discipline produces results, both in terms of work product and personal advancement.
However, I have serious doubts about the merits of writing a book about a subject intricacies and philosophy of which you have not yet had the chance to distill through the lens of experience.
The method may, perhaps, work for simple recipes, how tos and other procedural knowledge. I really don't think it would work for anything in or above the intermediate range of content on any meaningful, commonly deep topic.
Just imagine whether the "Mythical Man Month", "Code Complete" or "Innovator's Dilemma" could have been written with this kind of approach.
I don't know about others but when I read a book, I sometimes realize the presence of an unavoidable slight bias towards believing the author and respecting his conclusions, that is unless I am already deeply knowledgeable about the subject and have my own strong opinions. It better be the case that the author is in fact trustworthy on the subject.