No company is under any obligation to sell parts to anyone in particular. The law worked in this case (perhaps by accident). He was able to swap parts from one car to another, which is something that car manufacturers don't want in some cases. You may find replacing electronic components on one vehicle with those from another doesn't work - it's in the name of theft prevention, but that's at odds with right to repair. That didn't happen here, the only obstacles he really had were availability of information and parts.