They think they've outsmarted the law on that one. The system is setup to generate a bunch of false positives on its own, so a "match" which is below threshold

They think they've outsmarted the law on that one. The system is setup to generate a bunch of false positives on its own, so a "match" which is below threshold may not actually be a match-- apple can plausibly deny it. It's unclear if their claimed threshold of 30 is before or after the false positives they intentionally introduce. I'm going to guess it's before.