It isn't like we can shake a tree and have bunches of bass/bass luthierie books tumble out. For the longest time the Elgar trilogy was the whole ball of wax, yet many errors have been pointed to in them. David Stanton's little paperback on the double bass never got well enough known for people to dissect it, but Paul Brun's certainly have and have received their share of dissenting opinions.
Traegar's is no different, and I have no doubt that Mr. Condino's quality entry into the field will have its detractors, as will Mister de Villers' and Mr. Schnitzler's (you're on the clock, guys).
It isn't necessary to write the ne plus ultra immaculate bass book. All we enthusiasts want is a credible compilation of ideas and information about how these polycordal leviathans do what they do and how, on a case by case basis, to get them to do it better. We don't expect a one-fix serves all approach. That's not how it works for electric basses, and DBs are more complex by far than slabs.