AnthonyC comments on Harry Potter and the Methods of Rationality discussion thread, January 2015, chapter 103 - Less Wrong Discussion
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In that scenario he could become a closed timelike curve: go back, become the being that invented magic in the first place, and program it to record the brain states of everyone at every moment in there lives for future recall given a spell or ritual that he would then know. This could also explain the "Atlantis erased from time" business. It would rely on magic changing the laws of physics in a way that allows magic time travel to operate before magic existed - or for the invention of magic to have happened outside the timestream.