ReevesAnd comments on Harry Potter and the Methods of Rationality discussion thread, January 2015, chapter 103 - Less Wrong Discussion
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If Harry gains access to arbitrarily powerful time travel (That's how I've interpreted your scenario. I apologize if I'm wrong.), doesn't that make the whole plot redundant? Can't Harry just go back to the beginning and tell himself everything?
I would guess that the time travel would keep the restriction that he can't change the past. So he could recover her body and resurrect her in the future, but couldn't change the past events.