I mean, I guess I can clarify that they're safest mass consumer vehicle?

I'll let you read through these links to decide where you stand:

https://www.greencarreports.com/news/1124439_nhtsa-to-tesla-...

https://www.cnn.com/2019/08/07/business/tesla-model-3-safety...

...

It sounds like the regulatory body doesn't like that Tesla is claiming they got a 5.4 rating out of 5, as they say they don't give out higher than a 5 rating - and it sounds like Tesla is using public data points to calculate that 5.4. We'll have to wait to see if this goes to court to see if Tesla's methods for stating their 5.4/5 rating is unreasonable - or if the guidelines perhaps are if they "cap" what rating a vehicle can reach based on comparable data; as Tesla states in one of those articles alone, ~40% of vehicles have a 5-star rating - so they argue it's important to be more specific to allow consumers to better differentiate.