Iron Man is a movie that has evidence that works for 2008, 2009, and 2010. Even before the book, the site here had 2008 and Fury's Big Week in 2011 so the "6 Months Later" was always ignored and the book is just further proof of that and even explains that Vanko worked on his armor and the 6 months comes from that. With lines like Vision's "8 years ago" in Civil War and Happy mentioning, he's held on to an engagement ring for Tony and Pepper since 2008. It's more than clear at this point Iron Man is meant to be around its 2008 release.
It's been brought up numerous times that Iron Man 3 in 2013 does not affect AoS in anyway
You might personally disagree with certain placements, but the goal here is to be as accurate as possible, and following the closest thing we have that's officially from Marvel reflects that.