The article says that these construction costs are 15 million dollars. That's not even 1% of the total cost that you mention. Actually rail is almost completed halfway. 

But operation will not start until these 15 million dollars and construction fixes are completed and the estimate time now is four years. But by that time we will already be starting on the second phase of the first increment of rail to Ala Moana. 

2020 will probably see in operation more than halfway to the Ala Moana Center we'll probably the see a lot of traffic at that time to the airport and perhaps to the Honolulu Community College.