Geeze!

The guy is looping the "running" part of the video and is doing a voice-over which was added later when editing.  This does 2 things, it shows the motor "running" while dropping the audio from that part so we do not hear it spinning down, and, he can talk during the video cuts which makes it look like it is running a lot longer as if he were talking live.  He was not.  You can hear the different audio qualities from just before this part and during this part and then right after this part.

So, I loop my video like 20 times and then add my voice talking during this part later and that way you think since I was talking, that means the video had to run continuously...but it did not.

I have very nice speakers on my computer system so it was easy to hear but I think any decent speaker will demonstrate this as well.

This was a poorly done fake.

Bill

PS  The audio quality difference comes from the fact that the regular part of his video used the mike on his camera and the edited part used his computer mike...big difference there.