It is from their 1st quarter earnings release. It is simple, standard math, illustrated a couple posts above. They reported 3,093 vehicles delivered in the Financial Highlights on page 3. They reported $285.5M revenue and $594.2M Cost of Revenue in their statement of operations on page 15. Cost of Revenue (COGS) / Vehicles Sold = cost per car. Loss per car is (Revenue - Cost of Revenue) / Vehicles Sold.
Maybe that is it... maybe depreciation and costs from an unused factory accounts for an additional $100K cost per vehicle. On the other hand... if the factory is not online yet, would it count under cost of revenue? Probably not, because it would just be a capital expenditure at that point.