Well, seems like the Steam DLC list got tweaked for whatever reason.
http://store.steampowered.com/dlc/99900/
I'm going to assume "Hannibal at the Gates" has been added to the list erroneously and was somehow cross contaminated from Total War: ROME II
So "Hannibal at the Gates" is for another game?
I'd assume so, because it doesn't sound Spiraly at all.