Yeah that is correct. Its been discussed quite a lot on the MK7 board.
Once your order has a confirmed build week, its basically locked as all the correct parts are then either at the factory or will be, in plenty of time for the car being built.
If you want to add anything at this point they would have to take the car out of its production schedule. Which means it would be a brand new order and possibly a new price if you ordered before the prices went up.