I slowed it down to 1/4 speed to check -- the autonomous video is sped up 3x, but the human video seems to be 1x. I say that because generally no one moves that slowly for a physical task, not just in the "problem solving" aspect, but also in the "getting a belt to the gears" aspect. So, it appears that the robot did a better job than the human, but I believe the human only spent 1/3 of the time in the clip. After stretching the belt, it was probably put on easily, and likely the human still completed the task in 2/3 of the time of the robot.

Reference video (saw your clip is robot-only, but the robot vs human video is more telling):

https://youtu.be/x-exzZ-CIUw?feature=shared&t=65