Interesting. Definitely haven't heard that one yet. Thanks!
This is the dialogue, from the wiki :
Vivienne: I have something for your silly group, Sera dear.
Sera: Right, I bet you have plenty.
Vivienne: A simple note for your Red Jenny associates. I believe it may point to anonymous holdings of one Lord Samerath.
Sera: I know him! Pisshead's hard as ice with his people.
Vivienne: Indeed. It would be a shame if his involvement in certain activities was revealed, his position at court weakened.
Sera: So, we hurt a real ******! But you swoop in? We help people, but it helps you more? (Frustrated growl.)
Vivienne: Try not to cry openly, dear, it is ever so demeaning.
Or maybe the folks behind Red Jenny are a even craftier and more skilled than we can imagine, basically recruiting a bunch of misfits and downtrodden and convincing them that they are doing this wonderful thing when in truth a lot of these folks, like Sera, don't even realize they are actually being used as pawns in a much larger game. They make not only very useful "foot soldiers" and gathers of information, but they also keep the group behind them shrouded in mystery because they themselves have no idea that the people they are working with are actually manipulating them into getting whatever the desired end result might be.
If someone goes looking for the "Friends of Red Jenny", well eventually they find someone like Sera who will honestly and forthrightly tell them all about the group - but of course no one at that level, including Sera herself realizes that there is much more to the Friends than what she knows. As a result anyone looking will inevitably run into someone like Sera and stop looking, keeping the group behind them well hidden and shrouded in secrecy.
Building on the point above : Sera has a clear need to believe that the Friends of Red Jenny are a simple help-the-little-guy type of organization. That makes her easy to use, either by nobles in their respective Games or by puppetmasters behind the entire Red Jenny organization. On the other hand, Sera's acting on her beliefs, and thus making her side of the Friends into exactly the sort of organization she needs it to be. She's no fool. (Even though her first Tarot card is pretty much the Fool.)
As for the retcon discussion, it would be really interesting if the writers had this in mind for the Jennies all along! If they didn't, though, no harm done. And I mean that literally - if the Jennies went from throwaway name in DA:O to an organization with a method and a purpose in DA:I, for me, that doesn't invalidate anything from the previous games or cause a critical unsuspension of disbelief. No harm done. They just fleshed out a part of the story, and fleshing something out by necessity changes it. (If you don't believe me, ask Cole. He knows all about changing as one is fleshed out.)
(edit : just trying to get the dialogue to where the lines are justified, and then had to add the line about Cole)