That's because AI as a buzzword means deep learning now, but there's plenty of other AI that doesn't use training data and requires good knowledge of the problem you want to solve.

If you look at one of the most widely used text books machine learning is one of seven chapters, and not all of that is deep or supervised learning.

https://aima.cs.berkeley.edu/

But as a long-standing (as far as computing is concerned at any rate) academic field of study, it has meaning, even if the precise boundaries aren't perfectly well defined.