I'd expect that what he means by "The VIN reads: 20KPJ6118" is the number that's on the title, as opposed to the number he says is on the door ... it is the case vehicles were titled by year of first sale, but he isn't saying the title calls it a year, just cites an "ID number" [VIN, which is what the line on the title would be headed], and the number on the door plate would still be the number put on the title, which doesn't seem to be the case
I'm bettin changed cab or phoney title, trouble anyway .... unless you paint over the door plate
Bill