Received new vehicle with nail implanted in tire-maybe.

I would take it to a different tire dealer for evaluation. I had a low tire on my truck a few years ago and the tire guy found a steel rod 1/4” diameter and about 8” long in the tire. He used a combo plug/patch. Inserted from inside the tire the patch covered the hole and the plug filled the hole. Lasted until the tire wore out. And it wore evenly along with the other 3 tires.

But if in or very near the sidewall then you are out of luck. Dealer not likely to help after you put that many kilometers on it.