No one sacked/disciplined... no mention of those forced to resign...
Technically no one was sacked but they were made to put in their resignations effective immediately...
IBM has tried to explain why trivially-small denial-of-service attacks took out the systems it provided for Australia's Census, causing a 40-hour outage. An Australian Senate Committee is investigating the collapse of the $AU10 million IBM-provided Census systems and networks in the face of attacks ranging from 210 Mbps to 3 …
Another point that I hadn't picked up on until the IBM submission was that they had a 40 hour outage at the request of the ABS. Admittedly they had 4 odd hours of downtime but the next 40 was not of their doing. Guessing that the ABS were too nervous to fire the IBM system back up again and went back to paper based system (and the $30M bill).
> bring down a decently designed survey site
I think you just answered your own question there. Their ddos mitigation plan was to block overseas traffic, which they self evidently didn't test sufficiently. But even if they did get that part right, that is a rather blunt sledgehammer which is going to both impact legitimate users (on VPNs, tor and possibly even those using overseas DNS servers) and is useless once the attackers figure it out as they will just switch to a botnet built from compromised Australian addresses or attack other infrastructure like Telstra/optus/tpg/iinet DNS servers.
That is because there wasn't a DDOS attack. IBM and the Federal government are still using that excuse so that they can cover their collective asses. The real answer is that there was poor planning of how people would be using the census site, and so only "average" values were used, and people were told to get online on :census night" to record the information requested, which resulted in a flood of households all trying to get their information recorded. If you take an extreme view of what happened, you could call it a DDOS, but it was caused by poor planning by the government and IBM, mostly the government.