A salvaged car just has damages greater than it's value. It makes financially no sense to repair that car, but it doesn't mean it is broken, has structural damages or is unsafe. If I get in a minor accident scratching both sides of my car, the damages will be more than my car is worth right now and the insurance would call it a total loss. But the car has absolutely nothing wrong with any safety features, electrical systems. So there is no reason for Tesla to automatically disable Supercharging. If they have good evidence that the car is unsafe they should probably disable it entirely. Driving it is far more dangerous than Supercharging. So disabling Supercharging or software updates doesn't really make any sense.