Reading the content it seems like 99% is only for detection of physical tampering, i.e taking the chip out of real thing and putting it in fake thing, which significantly decreases the intent tamper as you need to destroy the real thing.
Wow, if it's only 99% catching that condition, it seems even worse! (I read it as 99% re-recognizing un-mangled items, but yes, if it is 99999/100k re-recognizing a good tag, it might be ok to let pass 1/100 counterfeits).
