I don’t know much economics but is this a possibility?
Depends on where you live. If you are asking this, you most likely are not from global south and have no idea that big publishers dont give a fuck to regional pricing, they charge as mushc as possible if people are dumb enough to keep buying their games. So, yeah, if they think that all this crazyness around tarifs will work as an excuse to raise the game price, they’ll do it even to the global north.
Aoe2 Chinese DLC - 5 civs, 7 campaigns - 60 USD, let’s go.
Reading your quantifies reply I thought DLC got released/announced. Dayum. 
As far as I know there are no tariffs on digital goods basically anywhere in the world.
The EU is considering taxing digital services from the US though but that will likely not impact game prices.