You have to understand that the history depicted in EB is a kind of roleplay, all knowledge was base upon roman point of view and is a lot easier for modders to put certain types of units under certain country banners. I'm spanish myself and I have found myself some kind of "errors" about this matter and I agree with you in a 90%.

But we have to understand that the mod team has no one in with a degree on ancient history or classical era culture, all I can say that besides some mispellings ingame and other quite weird facts about the Iberian culture or innacurate ancillaries or traits, the mod is quite wonderful in the terms of history and playability.

And I am from the Canary Islands ¬¬ and my province is not present ingame ¬¬ ( but it has nothing of interest by that time to any of the civs ingame so I'm not that unhappy :P )