A one-time event? How on earth did you come to that conclusion?
Earnings growth in 2021 was from just one factory ramping production and constant reduction in COGS and operating efficiencies. What do you think is happening right now with Austin/Berlin. You do get that the biggest headwind from those two factories ramping is now behind Tesla right? Do you understand what's about to happen with with operating margins and net income now that they're past the inefficient/costly part of ramping volume?
Going from negative to positive is by definition a one time event.