Jump to 3:05 to see on-board footage with telemetry, showing throttle position, your see he's at most 50% on bends or a lot of the time 0%, and only 100% when in a straight line.
Nice find.
That's terrifyingly fast.
I wonder if this wasn't a historic car and this was actual period race qualifying or something how much more liberal the driver would / could be with the throttle application during cornering.
A lot of these big power turbo cars had massive lag and kick, so nobody in their right mind would dig into the boost mid corner. I also wonder how different this would be with a more modern NA GTP style car.
