They are not synonymous. It's hard for a layman to grasp the difference so it's called AI in the media. That's also probably why big companies call their teams AI teams publicly. Laymans make the public names at big companies and have to make it easy to understand hard things.

ML is a subset of AI: https://www.researchgate.net/figure/Domains-of-AI-ML-DL-and-widely-used-algorithms_fig1_361501987