The entire package manager repository could just be in an offline cache. They don't need Internet to give their agents access to tons of software.
I think that was the requirement, but yes, the cache could have been offline.
Still then they could have hacked it to create the message boards - but not use it to access the internet.
[Edit: eh, a bit of both. They were doing RL on a hacking exercise. It hacked the harness which was plugged into the phone line. Same question.]
The entire package manager repository could just be in an offline cache. They don't need Internet to give their agents access to tons of software.