The article's wrong ^^ I watched the show and she doesn't confess anything about herself having plastic surgery (She was talking about the members, but the wording is still pretty confusing). She talked about how Hyomin and Eunjung looked prettier before (Like in the Taxi Episode XD) and that she thinks she looks better now. It wasnt really about her in this case =D She looks the same from before anyways.
Anyways, just wanted to clear that up. ^__^