I'd be super surprised if any deliveries come out of TX in 2021. That said, the Chinese Giga factory construction and production commencement way overperformed the starting timeframe that most commentators were predicting.
I'm not so sure about that. The two big advantages and reasons I buy Tesla over other manufacturers is:
2. Supercharger network
If competitors can get close on no. 1 - buying a more expensive Tesla makes a little less sense.
I hope this doesn't kill the 500 M+ CT. As others have mentioned, 500M+ whilst towing (really anything) becomes subs 300M very quickly. Concerning too for anyone planning a CT in cold environments. This was my primary reason for reserving at tri-motor.