^^ Have they? I will only believe it when the main contractor arrives and starts work. In Dubai piling is always done by a separate contractor which is what you see finished here.
All the article says is various contractors have bid for the project, who knows if the owners will pay for it yet.
All of these big towers are having problems getting a main contractor. With the pentominium I think they're still deciding whether to build it now or try and wait and build it later. The developer of burj al alam wants to build now and keeps requesting bids from contractors but nobody will build for what they're willing to pay.