Correct! And that NUMMI run rate Toyota achieved was (supposedly) only 60% of the facility's total manufacturing capacity. It appears to be entirely realistic for Tesla to meet their 500k/year vehicle production rate at NUMMI.
Right, they ramped up expectations ridiculously high with the Model 3 unveiling, but before that and when Gigafactory was just being talked about (before official construction), they were talking about 500,000 cars per year by 2020.
It does seem like Tesla will soon (3-12 months) eclipse that record.