AI are algorithms to generalize from data, vanilla algorithms are specialized from strict human-made rules. A calculator is just us figuring out how to make arithmetics in base 2 instead of 10 and then designing physical circuits with ports that allow us to achieve our end. It would be analogous to AI if you showed a calculator examples of calculations and results and then asked it to generalize and be able to do maths outside of the examples it was fed. That's not how we made calculators in the past (but we can now with AI), if it doesn't generalize it is vanilla algorithm, if it generalizes it is AI, the generalization being a black box is exactly the point, if we knew how to generalize and it was easy we wouldn't need AI we would just code and design circuits that do exactly what we need.