[chjohasbrouck]

I think the market's expectation is that a DNS provider is prepared for a DDoS of any size, but not necessarily any level of complexity, so that's a lot of incentive to talk up the complexity of the attack.

What's described in this incident report is totally within the capabilities of a single individual with public knowledge, though. If they could have proven otherwise, they probably would have (unless that somehow conflicted with their criminal investigation).