Except that is really falsifiable. I pull data with TeslaFi and there’s definitely no shenanigans being done.
The simplest explanation is that it’s impossible to say (miles left) when you consume significantly more power going faster, going uphill, on a very hot day, etc. So they just go with the epa estimate based on your % state of charge and that’s it.
If you want detailed info the car will quickly give it to you and consider all those factors if you put in a destination