Yes I think your math is correct.
The best Tesla Roadster 2.0 can do is 0-60 in 2s. Here it is 0-60 in less than 0.5 seconds, which is 4 times more acceleration than the Roadster. And it keeps that acceleration for 4 seconds.
Rockets rule! I wonder what a Roadster 2 with SpaceX rocket technology will be like!