Wasn’t in my case but thanks for the inputThis is not correct either. I think Mr Miserable got his name from seeing all the misinformation and incorrect stuff floating around.
Generally speaking, if you are in the UK/Ireland, your car is usually made before you order it. Tesla predicts with some accuracy what kind of cars will sell, with various options, colours etc. They make them in batches that then go from the factory to the dock and are loaded on a RORO, which then heads out to sea with a well defined route planned. When your car order gets to the point of moving money around, your order is matched to a VIN of an existing car on a ship. You might get a car that is already sitting in Southampton or within sight of Italy or perhaps they need to make it for you. If someone else cancels, you might get theirs. There is no magic to this but a lot of variation occurs.