When they tell people cars are entering production, it may be they are telling people that your car will be going into production in the next batch, which might not start for a day or two. So they might only inform people production has started a couple of times a week. This might account for the varying time in production numbers.
According to Bjorn Nyland's recent video where he visited the factory, Model S and X production shares a lot of production space and they only have the two lines for final production. It may be that a batch of Model Xs are scheduled to start next which causes a few day's delay in more Ss going into production.
According to Bjorn Nyland's recent video where he visited the factory, Model S and X production shares a lot of production space and they only have the two lines for final production. It may be that a batch of Model Xs are scheduled to start next which causes a few day's delay in more Ss going into production.