I'd say no effect at all. As I understand it, the new system limits power to minimize wheel spin. In the case referred to, I doubt he had accelerated hard enough to cause a rear wheel spin.
For the sake of argument, let's say there was more power involved, or a more slippery road surface. In that case, he would have either accelerated out briskly with no wheel spin, or had a spin been imminent then he would have accelerated very slightly slower with no wheel spin. With a spin imminent and no ASC, then he would have accelerated out slower, or possibly fish-tailed into a worse situation.
So I see either no effect or a negligible effect. Without ASC there is either no effect, or a potentially serious loss of control.
It's like arguing that a skilled rider can stop faster without ABS. That may be true, but in that split-second that you need to panic brake in uncertain terrain, I'd rather have the ABS kick in than not have it and need it.
You could also make the argument that BMW's decades-old limit of 100 HP may well have caused him to not be able to outrun this particular threat, so that a more powerful bike is a safety advantage. But that would just be silly.