No, he has reiterated the same position he took two years ago. The article headline is demonstrably false even as the article itself points out when it quotes what he said two years ago. There is no change in position, unless of course you want to take the idiotic position that "if someone committed a crime" is a flip-flop from "if the person has violated the law".
At the press conference on Monday, July 18, 2005: If someone committed a crime they will no longer work in my administration.", is how Bush wrapped up his answer. "If there is a leak out of my administration, I want to know who it is and if the person has violated the law, the person will be taken care of," he said in September 2003.
I could not have said it better myself