I believe the issue was not that he "customized" the truck it was that he VIN swapped and then never stated that he did so in his ad. He was trying to sell the truck as a vehicle year it was not without passing on that info. He was called out multiple times in the beginning that there was no way for it to be a '73, and he just said no one had to worry about it...
Maybe Im a rare breed, but Ill admit there would be times that I would VIN swap a truck. But what I wouldnt do, is try to hide that fact if I ever decided to sell. Regardless of your day job, everyone knows its illegal. If youre willing to take the chance doing it and the buyer is willing to take the chance purchasing then thats one thing. But for a buyer who doesnt know any better, to walk into a thousands-of-dollars deal and potentially lose the truck because the previous owner hid information.... thats fucked up.