No, or Yes, or Depends...
Your need is to have the engine at an appropriate rpm or headed there very quickly, so just like in clutch karts to keep the clutch fully engaged, you can give the MINI CVT throttle before it would otherwise be done.
There could be a moment where you would have both brake and throttle applied, but not very long.
The brakes are being gently applied to balance forward thrust with the limits of the corner. It's something of a "dance", gentle footwork, careful timing, and a "release" of the brake to let the car engage leaving the apex of the corner.
I don't think you "stuff" the brakes.
In that description of Portland International Raceway, Turn 7 is where this works sooo well. I should go back to read it too. Ask another question if this makes no sense.
