The whole thing is an unholy mystery.
What I've heard is that if it doesn't recognise a 'coded' key then no dice. Except mine will start with a blade key with nothing else (the spare without the remote fob). The bulletin you linked though implies its activated by an attempt without a key (coded or otherwise) ie, good 'ol 'hot wire' and what is detected by PL is lack of key/barrel rotation or, lack of key in barrel. The latter is plausible because the truck knows when the key is in or out (without any rotation) - as anyone with that damned chime will testify!
