falenas108 comments on Harry Potter and the Methods of Rationality discussion thread, February 2015, chapter 110 - Less Wrong
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Supposing (though it might be wrong) that mirror-Dumbledore is speaking truth, it's not clear that he realises what Harry is until that point in ch17 where he starts laughing. Which is after Harry has received the cloak. (And, I think, after D. has promised not to take it away from him -- though he hasn't promised not to require him to store it somewhere secure away from Hogwarts.)
That is when Dumbledore realizes Harry is a "good" Tom Riddle. We don't know when he realizes Harry is a horcrux.
EDIT: In fact, it's almost certain that Dumbledore realizes that Harry is a horcrux before that scene, or at least suspects it. It doesn't look like anything in that conversation in particular would make him realize that, and he clearly knows it by that point.