I read this as saying: we start braking lightly when detecting an unknown object, applying more braking force as it becomes clearer that this object is a collis

I read this as saying: we start braking lightly when detecting an unknown object, applying more braking force as it becomes clearer that this object is a collision risk. Once enough human or autopilot trips detect the same signal with no collision, whitelist the signal and cease braking-and-monitoring behaviour. I am probably misinterpreting but that is what makes sense to me.