This is an update to a previous post found here. Architizer updated their story with a few caveats. The story came from "anonymous, unofficial sources", and Adrien Smith + Gordon Gill Architects "categorically deny the design featured" on the site and involvement in any "design of a 'mile-high' building". So there you have it. The whole thing is hot air.
Via @gary_hustwit again. [I don’t know where he’s getting “still unconfirmed”.]