Exactly. The article is not credible, unless they name a better source than some ambiguous "mole". It just sounds like someone making up a rumor for page hits. The site it's posted to is not at all credible either (the site is full of outright lies and rumors with no basis in reality).
I wouldn't even bother getting excited over this article until this information is confirmed by a credible, named source within the Disney / Lucas organization.
Besides Vader would not exist. Anikin was redeemed before his death, so he'd be Anakin Skywalker, not Vader.To bring Vader back as Vader would mean ignoring the entire ending of ROTJ. Which would tick off fans worse than the new trilogy did (and likely kill the franchise too).