Both you and the article are starting from the assumption that a biometric identifier is a password, because that is the only way in which "compromised" means "known." Publishing a voiceprint does not compromise it as an identifier. Compromising it would mean someone somehow gets the ability to speak in that voice. (Maybe more believable would be that a bad guy finds a suitable voice double for a person of interest). Then you'd have to revoke it as an identifier, and yes, that would be a lot harder than revoking a compromised password.
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