The thing is, a rated mile contains a certain amount of energy. If they change this value, the displayed range will change, but there will be no actual change to the energy or the achievable range.
People with the new SR+ I guess could use the energy screen method outlined in the sticky, and they can actually get the “charging constant” value if they switch to miles/km display, too. Unfortunately for new vehicles, the energy screen method only gives a lower bound for the available energy. However it does give an idea of Tesla’s design targets.
For prior vehicles (2021 SR+ non-LFP), the degradation threshold with this method was about 53.5kWh, as I recall (charging constant was 203Wh/mi). Not 100% sure about these numbers, but I think that is how it worked out. Easy to confirm for 2021 SR+ owners, anyway.
If done, this could reduce some of the confusion here, or at least allow owners to compare usable energy targets to the earlier SR+ version.