Per your links, the minimum permissible weight of an F1 car is 731kg including the driver, but not fuel. For FE it is 800kg. The 2011 Tesla Roadster weighed 1235kg, sans driver. The 2011 Bugatti Veyron 1834kg.

The very long range also suggests that this car will weigh considerably more than the old Roadster. Maybe there is an improvement to traction with all that extra weight? Or maybe the weight just helps with keeping the wheels on the ground at 250mph?