1) These are more share similar visual features than crypto hashes.
2) HN posters have been claiming that apple reviewing flagged photos is a felony -> because HN commentators are claiming flagged photos are somehow "known" CASM - this is also likely totally false. The images may not be CASM and the idea that a moderation queue results in felony charges is near ridiculous.
3) This illustrates why apple's approach here (manual review after 30 images or so flagged) is not unreasonable. The push to say that this review is unnecessary is totally misguided.
4) They use words like "hash collision" for something that is not a hash. In fact, different devices will calculate DIFFERENT hashes for the SAME image at times.
One request I have - before folks cite legal opinions - those opinions should have the name of a lawyer on them. Not this "I talked to a lawyer" because we have no idea if you described things accurately.