After I posted the above I decided to do the math for range.
And this is where things get a little disappointing.
60% of 314mi (500km) is close to 190mi (305km). In 30 mins. So it's definitely average, but not reason enough to cancel my R1S reservation.
I'm curious to see if the Hummer will...
If MotorTrend is right, that's a very impressive average charging speed. Assuming 133kwh total, 60% means nearly 80kwh. In 30 minutes. So an average rate of 160kw.