User blog comment:Hyperborean/"The House of Hades" – official expectations blog/@comment-5210020-20121020230704/@comment-4531192-20121023085103

He said that because immortal being cannot die for the simple fact that they are, well, immortal. They can fade and their essence can be consumed or scattered, but they cannot die. What happened with Kronos was that his essence was scattered. He was literally blown apart, meaning he presumably cannot form again.