The english reporting is weirdly focused on the "display" part. If you bill people based on a measurement (be it power to a building or at a charger, fuel volu

The english reporting is weirdly focused on the "display" part. If you bill people based on a measurement (be it power to a building or at a charger, fuel volume at a gas station, weight of product in a supermarket, pretty much whatever) there are standards for the measurement devices used, the devices need to be certified to fulfill those, are spot-checked occasionally, ... and various chargers (not just Tesla) don't use such a certified measurement device. While the display is part of the requirements, because the measurement device needs to be checkable standalone, it's not just "they aren't showing the numbers in the right places". (and in reverse, of course nothing stops them from showing the numbers in an app too - but they need to get them from a "proper" energy meter)