After watching the video, it seems that they are distinguishing it by the fact that it was a man-made object created for the specific purpose of producing music

After watching the video, it seems that they are distinguishing it by the fact that it was a man-made object created for the specific purpose of producing music. This of course still allows for other pre-existing natural objects to be used for music playing. For example, I assume prior to creating a flute, human ancestors likely batted rocks together or beat rocks against hollow logs to create a beat or variants of music. But the significance of this finding is that it was purpose-made for creating music, which is interesting since it hints at the cultural impact that music may have played 60,000+ years ago.