Wait... no... it's JUST a flashback, nothing more. By "Between this and the other world", Madara more than likely means that Obito was at deaths door/on the very edge of his life. Thats not another dimension.
Square Enix, create a sequel to TWEWY. You have 3 years. Fail and face erasure. - The Fanbase MEGIDOLAON FOR EVERYONE - Lizzie. Hello? Dead kid speaking - Neku