Earlier poster here: Nah, it's a actually a real thing, it's just not relevant anymore since the major recall GM had a while back and the signs remain as a vestigial thing.

This is what I meant earlier when I said 'free battery replacement', since the previous poster had referenced battery issues. I was suggesting that they could've put a bunch of miles on the original battery and gotten a new one since a recall was (probably) already in the pipeline by the time OP was shopping.