When I had mine installed at Camping World and they fired it up, holy cow, I couldn't believe how loud it was! BUT, it was still in the shop and the metal roof was not to far above it so it bounced the sound back down.
But before that realization, I was about to tell them to take it off. That is was the loudest AC unit I had ever heard! So they called Coleman and they said the increased volume is caused by the fan pointing straight up as opposed to the squirrel fan that is in most others.
Upon pulling the unit out of their garage, it sounded much like yours did the the video, very acceptable and very quite inside.
I can live with that, and the fact you can run with the Honda 2000.
Cheers!