It sets a bad precedent to call things like this hacks.
Firstly, calling this redaction implies that the data is missing, and calling what was done "unredacting" is akin to saying someone "decrypted" a cryptographic hash function.
Nobody unredacted anything here, they merely discovered that it hadn't been redacted, and simply looked like it was redacted.
Calling this a hack places responsibility on the people who discovered the information, rather than on the people were put in charge of handling the redaction and screwed it up.
Firstly, calling this redaction implies that the data is missing, and calling what was done "unredacting" is akin to saying someone "decrypted" a cryptographic hash function.
Nobody unredacted anything here, they merely discovered that it hadn't been redacted, and simply looked like it was redacted.
Calling this a hack places responsibility on the people who discovered the information, rather than on the people were put in charge of handling the redaction and screwed it up.