Despite his claim, the authorities do not suspect him to be a part of the Anonymous Norway neither suspect the group involved in the DDoS incidents,
because of the fact that the suspect joined the group’s Facebook page on the same day of the attack, may be in an effort to show himself linked with the group.
Furthermore, the hacker provided a Pastebin link via a tweet, pointing to the identity of the perpetrator i.e. "Jamie Y. Isaksen"; they did not create the post, just scooped it up.