According to Orci and Kurtzman on the commentary track on the ROTF Blu-ray all 3 of the Arcee Triplets are killed in the battle (we do see two of them killed on screen). I'd say that qualifies them as officially dead in 2009.
Also in DOTM they make several references to the fact the events we are watching are taking place 3 years after the Transformers became officially known about by the public which happened in ROTF when The Fallen made his speech and asked for Sam to be turned over. So that puts DOTM in 2012 not 2011.