They even announced that they just waited till there was a high volume of traffic before using their weapons. But indeed some parts of the world were down for some minutes. Even the gaming servers hosted on the Amazon.com infrastructure might have seen some payload.
Gizmodo sources close to Amazon.com have told them that the outage was not related to any outside group. It will be hard for Amazon.com to prove that they were DDOSed as attacks might have come from legitimate sources all around the US/world. And it would be bad for their image. They will update if there's more to say, but it sounds like old NaziGods was full of it after all.
Seems that shortly after the attack on Amazon.com they tried to attach Nike.com but failed.
But how heavy was the weapon that NaziGods claimed to have used ?
It's all about a skid that makes time to prepare, to be patient and a bunch of badly secured servers hanging on the net.