Harry couldn't see Confundus!Quirrell's CEV in the mirror (the conversation with Dumbledore's family.)
What the man might be seeing there, Harry could not tell; to Harry it seemed that the flat, perfect surface still reflected the room behind it, like a portal to another place.
So I take from that the Dumbledore in the mirror was real, and not a victory fantasy of Quirrell's, since Harry could also see it.
Also, Dumbledore mentioned how he laughed when he found out that Harry was a good version of Riddle, which many readers have taken to refer to this scene in Chapter 17:
...Dumbledore started laughing. Laughing a lot harder than Harry would expect, almost howling. It seemed positively undignified. An ancient and powerful wizard ought to chuckle in deep booming tones, not laugh so hard he was gasping for breath. Harry had once literally fallen out of his chair while watching the Marx Brothers movie Duck Soup, and that was how hard Dumbledore was laughing now.
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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 110.
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.)
Spoiler Warning: this thread is full of spoilers. With few exceptions, spoilers for MOR and canon are fair game to post, without warning or rot13. More specifically: