Jim,
I read:
1. The car was assembled in Dearborn
2. The assembled car was transferred from Dearborn to NJ
3. The NJ assembly...did stuff
4. The car was shipped from NYC port to Euroope
My point is that #3 only makes sense if the work performed in NJ was only the specialized export type stuff, which is probably what the post intended to say.
When I first read it, my first thought was that that the poster was saying that the car was partially assembled in Dearborn, then finished in NJ. This is probably just a case of reading into it too much.