Would be interesting to see if you got to over 508km if you were able to get over 81kWh. This “capping” was something they did on 2018 vehicles heavily, but it’s not clear to me how it works now.
The core question here is whether a brand new vehicle can ever display more than the EPA rated range (which would be 507km) - so it appears the answer is now yes (since you see 508km displayed in the car, I think?). But it is really close so would be more definitive if you charged to 81kWh and got 510km (for example - not sure exactly what the number would be, might be 509km).
On 2018s they were really hard capped as far as I can tell, to 310 rated miles, even if energy far exceeded the 76kWh (245Wh/rmi*310rmi) that that number implied for that vehicle. (Those vintage vehicles also started with 77.8kWh AFAIK, according to SMT.)