Everybody advertises the EPA numbers, and that's generally what people use when buying new vehicles. This article isn't about the EPA numbers, it's about what number is displayed as the range on the dashboard. And on non-Tesla's that number varies based on driving conditions, so it'd be a poor number to base buying decisions on.
To be fair, the EPA's rules have basically left the door open for them to do it. In addition, their customers tend to be very tolerant of their product quality issues. Other automakers don't enjoy such latitude.
"Every other automaker has a different approach to sharing those estimates, but it often tends to be closer to reality than Tesla’s approach."
It's not clear how much that information affects whether or not someone buys a Tesla vs other EVs.