15,000 construction workers working on the World Cup have not died.

15,021 non-Qataris have died. The number includes any expatriate in Qatar - teachers, managers, fast food servers, VPs - everyone. Even among construction workers, the vast majority are working on projects that have nothing to do with the World Cup. For context, something like 80% of the 2.6m people in Qatar are expatriates, and these deaths occurred over a 9 year period. You can do the math.