I'm curious where you found this definition of redundancy as I have never seen/heard it used this way (correctly at any rate). I understand that language is fluid and perhaps through usage the meaning has evolved but in my understanding the meaning of redundancy is : the state or condition of being superfluous or unnecessary by virtue of repetition. Therefore to meticulously examine a knife for flaws only to beat and abuse it later is not a redundanncy, although some might consider it insanity. Examining the knife for flaws repeatedly could be considered a redundancy as could owning two of the same knife...just sayin...
re·dun·dan·cy
noun \ri-ˈdən-dən(t)-sē\
: the act of using a word, phrase, etc., that repeats something else and is therefore unnecessary
: a word, phrase, etc., that repeats something else and is therefore unnecessary : a redundant word, phrase, etc.
: a part in a machine, system, etc., that has the same function as another part and that exists so that the entire machine, system, etc., will not fail if the main part fails