I haven't gone through all the research to fully understand the argument, but I watched the videos. Not convincing at all.

If I were to make this claim, I'd show a chimpanzee at rest in the video, without any music, then start the music. And actual music, not this loud machinery that would make me sway left and right due to stress.

Edit: not saying that chimps don't dance. Just that this is a very unusual setting.