One very noteworthy thing from the article: They claim to be able to read back configuration from a otherwise erased device by changing the reference voltage of

One very noteworthy thing from the article: They claim to be able to read back configuration from a otherwise erased device by changing the reference voltage of the read-sense amplifiers "used by the backdoor" (=the undocumented command that allows reading back the supposedly write-only configuration data). (pg15, top paragraph)