You're not the first one to say it, but I don't think they said they wouldn't add more DLCs, just that they wouldn't add more civs. Adam Isgreen made these comments on it:
This seems to me that they actually want to add DLCs, just not add civs.
Well, yes, whatever, they are actually adding civs so it's a lie anyway.
I guess we wound0t care about dlc with new campaigns or bizarre game mods