I am Long TSLA and I think the results are great to show where the company could be without a huge growth trajectory. Having said that, the 600MM increase to AP is probably mostly to do with the CapEx, which they estimated at ~$1B for Q4. This may be a small profit but next quarter is a massive loss. Sell roughly the same cars, remove another 750MM in capex and 130M in ZEV and you get a loss of 850MM at least, which I understand am ok with.
In my opinion, the biggest positive item is the SG&A expenses barely moving compared to sales volume. As long as the 600MM in AP is not related to SG&A expenses this is a huge sign of Tesla turning the corner on efficiency.