Leyrann
Deity
Average AAA game in 2023 had a dev budget of 200 millions. Civ has maybe 10% of that. A AAA game like GTA 5 sold 210 Million copies. It is a completly different league than civ in terms of sales. Firaxis is a great developer but that has nothing to do with some AA or AAA label.
Literally everyone considers Civ an AAA game. I've seen this label put on the series regularly for a decade if not longer. It doesn't matter what you personally believe should and shouldn't be given the label, general consensus is that it's an AAA game.