In Five Years Gone, Mohinder shows the past Hiro Nakamura the comic book and tells him that the events in the book show that Hiro kills Sylar in the past, but this had not happened in the future that they were in.
Mohinder shows the past Hiro Nakamura the comic book. This is in Five Years Gone. Hiro kills Sylar in the past. This is what Mohinder tells him in Five Years Gone. The events in the book show this. They were in. This had not happened in the future this.