Since I don’t track it:
1) Which past model years were affected?
2) It sounds like you are saying it showed up as a range increase on the indicator in the car, for existing owners, right?
If they are doing this, they may be relaxing their obsession with making the rated miles match what the car has always had (in spite of underlying efficiency improvements). There’s no reason they have to keep doing it this way though. It’s just a constant adjustment (unless there is a capacity unlock - which they did for the 3LR RWD, without changing the constant).
Obviously it doesn’t matter what the miles in the car say as long as it is not a capacity unlock. It makes no difference to achievable range. But they may get fewer customer questions by just changing the display when they also update efficiency. I'll believe it when I see it though. It's quite rare, so far. In fact I don't know of a vehicle where the constant has changed, except briefly on 2020 Model 3 AWD models, right after release, it changed from 2019 constants to 2020 constants.
If you're talking about this:
Tesla gives big range increase to Model S Performance - Electrek
That seems like a totally different thing than what I was talking about. This change would presumably apply to the 2021 Model S, not be retroactive to prior model years, and match the EPA rating (estimated at the moment).