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Not true, but the quote you had was correct.
Pressing nothing, you have DSC on and traction control on. No spinning tires, no spinning car.
One press of the button puts the car in DTC (dynamic traction control) or "fun mode". This lets you spin tires, but not spin the car because DSC (stability control) is still on. DSC monitors yaw rates to determine if the car is about to enter a spin.
Holding down the button turns off DSC and traction control, so you can spin tires and spin the car.
Trust me, I do a lot of track driving and have explored the modes. In DTC, I am slowed down on the track not because it limits my tire spin, but because the stability control engages by braking individual wheels when rotating the car during trail braking.
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