This has probably been asked before but I didn't find it...

Last year I got the AmEx Delta Platinum card for some 50k bonus miles. I cancelled the card about a month ago.

Today I got an email offer for the AmEx Delta Platinum card again! This time some 40k miles for getting the "new" card. Is this possilbe? THe fine print mentioned limitations if you have a current AmEx Delta card, but I didn't see anything about having had one before.