He could have beaten Djokovic at the AO if he had bothered to show up in 2009-2010 instead of losing one match before both times.He didn’t that’s on him. Just like it’s in Federer for not working on his game to beat Nadal on clay, Djokovic at AO, etc
Federer did beat Nadal on clay, just not at RG. But neither did Djokovic really. 2015 Nadal was a shadow if his former self, Djokovic needed no adapting to beat that shell of a player.