He has the right to review both, or none at all. It’s his purchase, if you were to ask me my opinion, I’d be pissed that I received two cars with proper issues. I don’t care if Joost fixes the gun covers, what about that paint?It's not me a problem. It is a factually unethical thing to do. No reasonable person on earth thinks its appropriate to treat a test batch product like a final offering.
If you think he should give a final review of a test batch product like its a final release then you fundamentally dont understand what a test batch is. This isn't an opinion.