First to file has nothing to do with prior art. It’s about what happens when two companies claim to have invented the same thing.
In particular, the paragraph starting with "Although some of the provisions of AIA 35 U.S.C. 102(a) and (b) are similar to pre-AIA 35 U.S.C. 102(a), (b), and (e), the AIA has introduced a number of important changes with respect to prior art ..."
Edit: And more importantly, Section 2152.01 right below it.
It actually does change the dates for when patent documents are considered prior art (as described in the first paragraph I referenced), so it is easy to get the issues confused.
The effects of first to file on how prior art works are, in my opinion, way more important than the litigation edge condition it eliminated.