The car has NY plates in the picture you posted as well... Plus there's pretty much no time that there isn't traffic on the Cross Bronx... so, yeah completely plausible.

I was stuck in traffic next to this car on the Cross Bronx Expressway a few years ago. I had no idea it was 1 of 1. Neat.

I contacted the seller to buy this car almost immediately after the ad went up on Tuesday, I wanted to set up a time to view the car on Wednesday and finalize a deal. This is the response I received from the seller on Wednesday morning: