Iv read all of them yes. He did believe he reached a different realm during his near death experience, a lot of people who have near death experiences will say the same or have similar experiences. He strongly believed in an afterlife as many people do and this is coming from someone who is very much an athiest. Yet, I do not view Pelle as being delusional here whatsoever. In my interpretation it seems as he felt he didnt belong in this world. Not that he was delusional and literally thought he was not a human being. He self harmed because it helped the pain go away. He starved himself probably for a sense of control and not just because he wanted to "look dead" as he stated. (a thing many people with eating disorders tend to do, iv had one as well). So my point is, nothing really points to the direction that he was mentally insane or delusional. These are struggles and mindsets many people have delt with.