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).
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).
If this is a rumour, and not true, whoever made it up obviously knows nothing about Star Wars "it will be science fiction to remember" Oh how ignorant you are