Sheaman3773 comments on Harry Potter and the Methods of Rationality discussion thread, March 2015, chapter 119

[Sheaman3773]

So, this is the single change that makes this story an AU?

From chapter 1:

This is not a strict single-point-of-departure fic—There exists a primary point of departure, at some point in the past, but also other alterations. The best term I’ve heard for this fic is “parallel universe.”