Very faulty figuring
They arrived at this by taking the development cost of the Volt and dividing it by the number that have been sold so far, then adding in the actual cost of building each unit. That's ridiculous, they're not going to stop making them today. They will probably make other models based on the same technology, too.
They have yet to recoup the r&d costs, is all this calculation tells you. They're not losing money on each one they sell - each sale brings them closer to the day when the development costs have been recovered and the model becomes profitable.