something that every other phone manufacturer has is an "incredible feat of engineering,"
One crucial missing bit of information is the actual reliability and security of respective systems. Fingerprint identification had existed long before Touch ID in consumer devices, but it simply wasn't that secure and prone to false positives. Same applies to Face ID : Some phones had it long before the iPhone, but the security simply sucked big time.
An optimist interpretation of that phrase would be that it's an "incredible feat of engineering" in regards to the security levels and false positives ratio Apple wanted to reach.
Or it might indeed be just marketing BS.