[zaroth]

This wasn’t like they hacked into the network so they could deface a website or pop up a “You’ve been hacked!” message on the machines.

Recall the Iranian attack on Saudi banks which encrypted 30,000 desktops and destroyed the backups?

The implication is that the attack caused permanent or difficult to repair damage to the systems. There is a quote that they expect it to take months to bring everything back online.