I get the feeling from Voldemort's comments and Harry's thoughts that the Letters of False Comprehension have a mind affecting power that prevents you from understanding them. I think the inversion is a joke for the readers.
I assumed the inversion was because the mirror was somehow reflecting the phrase, or at least that it's some kind of artistic flair meant to suggest so.
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 109.
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: