I think the point is "here's the desired properties for a cryptographic hash, and here's a practical demonstration of how non-cryptographic hashes don't have th

I think the point is "here's the desired properties for a cryptographic hash, and here's a practical demonstration of how non-cryptographic hashes don't have them". I don't think this is meant to be a surprising outcome if you know about the definition of cryptographic hashes, more just an interesting demonstration of how specifically non-cryptographic hashes are non-cryptographic.