I don't want to keep this machine without it arriving working.
Numerous times I have bought items off ebay and elsewhere which required adjustments to get them to work properly or optimally. I don't consider needing an easily done adjustment to be the same as defective, because it's just sort of the nature of buying used. It could have even happened during shipping.
If a quick adjustment solves the problem, why go to the trouble, time, and bad feelings of a dispute, along with sending the unit back and finding another if you prevail? If the problem can be readily solved, solve the problem and get on with doing what you bought it for.
I do use a digital device in my photographic pursuits when necessary.
When someone rags on me for using film, I use a middle digit, upraised.
CPE2 is a small robust processor. You can turn it on for a short time to check the motor, no problem. But I won't turn on without water for any longer.
My stance with the auction is that: after you receive the item and find any ANY problem, immediately report it to the seller with evidence. If you do anything with it, you void the default (unspoken) rules on warranty and return. Then the item becomes your property and the seller can refuse to take it back. In your case, your video is the clear evidence that you turned on the machine without water, which is against the Jobo instruction. The instruction manual clearly says "10) Never operate unit without water in bottom trough. Water level should be at least 5 inches above the bottom of the unit."
From what you described, you should be able to adjust it to a good working condition. Spend some time and fix it by yourself.
A photo amateur
Sinar P2/F2/Nikon F100/Bronica ETRSi/GS/Saunders 4550XLG/Jobo CPP2/CPE+/Colorline 7000