I am sure the Swiss papers may have said that. However as the last year or two have shown the Swiss papers tell incredible lies when it comes to SR and Swiss. None of the other papers or news services that have written about this have made OneWorld sound "so close" so I would tend to doubt it at this time. BA has no reason to let Swiss into OneWorld, they can steal their pax with the deal that they have just signed. Obviously Swiss is hopeful that this step will bring them closer.
In short this article is written for a local audience, the same ones who were so assurred that SR was such a "strong" airline by their local papers!