The Julian Assange "poison pill" link was posted on Twitter, and later the password to the archive was also posted. This provided FULL UNREDACTED versions of all the leaked info.
Relatedly, Assange described the files not as "dead man switches" to be unleashed in case of his arrest, extradition, killing as the media liked to portrait it, but instead said that the insurance files contained (unredacted) data that wikileaks intended/intents to release later anyway, in redacted form, and that the encrypted unredacted data was put online to be backups if wikileaks lost the data e.g. due to a raid. The remains of wikileaks activists could then recover the files from the torrents or other people who downloaded the torrents, and could decrypt them to get the data back (but wouldn't release the password into the wild).
Of course, that's what he/they said, and he/they might have lied. But so far we don't know, because no password has been released.