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Probably not the correct term but it's what I see happen whenever they have widespread listing corrections. They will go and mark a lot of cars sold, correct the listings and republish. This happened to a lot of cars the day I tried to buy my P85 which they claim was priced $18k too low.
Currently I see quite a few as old as 2016 offered with free supercharging.
The "one year" is for new cars. I see most used cars now come with non-transferable, lifetime of ownership, free supercharging. Seems to exclude vehicles with 70 and 85 batteries.