As said one could have a different perspective on this, it's all coming down to semantics really.
And there is no mention of 6-ara being the original group in this specific article thus will need to stay in bounds and not into an origins discussion lol.
T-ara's origins are very well known honestly (just in my own observation, I have not seen any fan who doesn't know about them). New fans who take an real interest in the group will always come to learn about their story and how they started out.