I have no doubt about the main book being valuable, it is just that a summary like this of a book of interviews like this one doesn't get all main ideas across, however, I liked this summary from the perspective of getting a taste for the book to decide whether to read it or not, and I think that this summary is good enough.
I tried to take the shortcut although I love Tim Ferriss' books because I couldn't really clinch into the Tools of Titans (still having it on my Kindle unread for 12 months). But the summary was not compelling.