Voldemort will probably tell him
I don't think that's a foregone conclusion, and not one Harry would be willing to bet his life and the fate of the universe on. Voldemort specifically said that he doesn't want to tell Harry because telling him could make it come true. Harry has to convince Voldie that it's not just okay to tell him, but beneficial to his goals to tell him. That's the kind of argument you'd have to craft here.
It could have made it come true BEFORE the Vow. Now Harry, having Vowed, is only ever a danger to the world through ignorance. Increasing his knowledge cannot increase the danger he poses the world.
This is a new thread to discuss Eliezer Yudkowsky’s Harry Potter and the Methods of Rationality and anything related to it. This thread is intended for discussing chapter 113.
There is a site dedicated to the story at hpmor.com, which is now the place to go to find the authors notes and all sorts of other goodies. AdeleneDawner has kept an archive of Author’s Notes. (This goes up to the notes for chapter 76, and is now not updating. The authors notes from chapter 77 onwards are on hpmor.com.)
IMPORTANT -- From the end of chapter 113: