But it is though… AI was started long before computers were made.

AI at its core means “intelligent behaviour exhibited by non-natural/Artificial means”. This means that if your OS “intelligently” switches tasks on physical threads on cpu that’s AI. If you go to supermarket and the door opens when you go near it, that’s AI as well (actually this example was in our intro to AI textbook).

So computers are a special case of AI, so are calculators.