News says he was inspired by that shooter so that makes sense.
That also means no point in reading too much from it. Could have been the Christchurch guy’s words plagiarized or could go further down the chain of plagiarism and be Breivik’s or even Kaczynski’s.
He clearly wasn’t describing his own life at least honestly because he wrote he has never had trouble with the law or mental health while we now know that police interviewed him for talking openly about shooting up his school.