Ads very rarely are re-run 4 years after the original airing. Also, in the case of the Pepper Steak chips, it was a new flavor (and it states this in the ad). You can't re-run an ad for a "new" flavor 2 years after it came out.
They're wrong, because I came across this ad on a tape that was recorded in 2002. All the Smiths chips ads are from 1998 with 2 exceptions: the Pepper Steak Club which is from 2000, and this one.