Your quote is equally meaningless. There is a definite difference between string follow and set, I take my definitions from The Traditional Bowyers Bible, course not all books and things you see on the internet are true.
You can perform this experiment yourself, string your bow leave it strung for a few minutes. Unstring the bow and measure the set. Let the bow relax for an hour or so, measure again, this value is string follow. Not deflex, and not set.