It sounded super robotic but I wonder if that was a function of how it was programmed instead of the drumming capabilities of the robot.
That would make it a toy project, about forty years behind the state of the art.
http://pinktentacle.com/2008/04/video-wabot-2-android-plays-...
I feel like you could script that performance out manually and have it be the same.
I can only see ML being involved if the ML's interface was an over simplified model with all of the individual movements pre-scripted, i.e only allowing it to decide when to position limbs and onto which drums, but not how, which isn't much of an achievement. It smells of lies and hype. I could be wrong but either way the result hardly looks groundbreaking.