Further down on OP's link...
WHAT ARE THE DATES FOR THIS PROMOTION?
The promotion is good on gift cards purchased at a P.F. Chang’s restaurant in the Contiguous U.S. (with the exception of the Atlanta airport), or online at
www.pfchangs.com from
5/5/14 – 6/15/14, or while supplies last.
Usually "or while supplies last" means the promo might end
sooner. Can anybody confirm that in this case it meant "we still had plenty on 6/15/14 and we really need to get rid of em, so the promo is still on"?