User blog comment:FTWinchester/Power Scale Musings/@comment-3481504-20130224034857/@comment-108.247.147.163-20130225222012

Although Eric Krripke is no longer showrunner, he has been retained as a consulting producer since Season 6, so as far as we know he gave his approval to retcon. In fact, it's  even possible it could have been his own idea renounce that Chuck was God.