This is my understanding as well. Game AI is about "looking" intelligent (or as someone else in this thread said, about providing a fun experience to the player

This is my understanding as well. Game AI is about "looking" intelligent (or as someone else in this thread said, about providing a fun experience to the player) and machine learning is about finding optimal solutions or predictions. Also, nobody wants to run a google-sized deep learning network or what have you in order to train a mere game AI.