@profoundlynerdy Biometrics *are* hashable -- any data is. What was possibly meant is that biometric hashes are too susceptible to collision, either accidental (resulting in misidentification) or voluntary (resulting in usurpation).
(had the "not hashable" statement not been "backed" by a argument of authority, I would have remained silent. Next time, don"'t deny others their opinions, and especially don't deny them that because "I know and you don't".)