Here's Troy's main flaw, at least in my opinion, when it comes to his estimate. In a couple tweets he clarifies why his estimate is low:
https://twitter.com/TroyTeslike/status/1318340018386182149
He's essentially saying that you can't take Q4 production/delivery rates and apply it to the whole year because of seasonality. The flaw with this is Tesla doesn't really observe seasonality and Troy's being duped because of the history over the past 2 years which was
Beginning of 2019 - Delivery logistics nightmare and affects of the tax credit expiring. Remember throughout 2019 Tesla was continually wanting to get to higher production rates but was dealing with Panasonic constantly not expanding at the same rate as Tesla.
Beginning of 2020 - Tesla was unable to deliver the cars it planned on delivering because of Covid. Tesla even said they were on track to have an all time high quarter.....not just all time high Q1, but all time high of any quarter before Covid started shutting things down. Both Q1 and Q2 2020 would have beaten Q4 2019 had Covid not been a thing.
Seasonality exists, but Tesla has enough demand to not see any impact from it like other auto makers....that are working within a addressable market that has fully matured.