But it does show a contradiction to public statements that they knew it was wrong ....
Gotta remember context, though. This is Hillary's campaign team, and in part (maybe mostly) they're pissed because it's messing with the campaign.
This e-mail chain (2015) doesn't give any indication that people knew it was wrong back in 2009-2012. Though we do know that at least some people were upset about it then, too.