Good lesson here in that the description can be flexed round the facts - dealer might have meant 2003 model year, which is taking a bit of a liberty but they maybe thought they were okay seeing since its only a few weeks in the difference.
Had an '84 Metro once, registered in March of 1984, and was doing some work under the dash one time when I found a paper lable hanging there listing works details for the car. I worked out from the information it contained that the car had rolled off the production line and had been parked up awaiting delivery to the dealer to be sold as a new car in November 1983 - which was up to 5months before it was sold as brand new.
Tales also came in the late 70s of Lancias and Fiats being up to a year and a half old (tho unused) before they were sold as 'brand new' cars.
Wife's imported japmobile wears the correct year-of-1st-registration number even tho it was first registered here some time after it's fourth birthday. It seems that a car doesn't start to age until it gets its numberplate, no matter how long it has waited to be sold.