As for double nuts assembly, vibration initiates loosening with the inner nut. With PLB v2, the inner nut's advance is blocked by the slower moving outer nut.
Most other anti-loosening kits use "friction" for it's anti-loosening function in spite of it's uncertainty. PLB v2 has a reliable solution. PLB v2 locks the nuts with a mechanical system that prevents them from loosening.
Severe vibration generates more blocking force. See how it works in the movie.
The first PLB came out in 2010. Since then, big changes that improve bolt performance were made to the thread pattern.