The bold actually states to avoid the pump if size or/and strength are the goal.
I think (even though it doesnt mention it) it means that working out strictly for a pump is not going to yield results.(which i certainly agree)
Its pretty much written for the skinny kids that only stay in the 15-20 rep range and wonder why they never get stronger or add any muscle.
But completely avoiding any pump is ridiculous in my mind. All my movements start and end with a high repetition set. 1st set is to get blood and nutrients into the muscle to prep it for the later-more demanding heavy sets to follow. And the last set is for the same point, to leave the muscle full of nutrients after it has been worked.
We lift weights and manipulate our diets so that we'll look good naked. Sure, it's healthy too, and we'll probably live a longer and more productive life than the average guy, but mostly it's about the naked thing.