Yeah, there’s only one map. It was never “in” the magazine, but available separately. What is meant by “maps” is the fact that it was available in both hi-res and lo-res versions, and that each map has different layers that can be printed independently. The page is still available in the Wayback machine, but the map is inaccessible.
I believe that all the Dragon and Dungeon magazines from that era are still available, but you have to have an active DDI subscription (and you can’t get one now if you never had one).
I have all of the 4e Dungeon and Dragon Dark Sun articles (and the hi-res version of the map), though I don’t suppose there’s anywhere I can post them without violating copyright.