You misunderstand my comment, maybe is my fault. Let's say the threshold is 10 , you trigger the threshold so Apple checks all the 10 images , but 9 are false

You misunderstand my comment, maybe is my fault. Let's say the threshold is 10 , you trigger the threshold so Apple checks all the 10 images , but 9 are false possitive and one appears to be a correct match, Apple will report you for 1 image ... so my point is that is not designed to catch people with big collections of CP, is designed to not trigger to often.