Did you read it though?
It's not related to the NRL bid, it's related to his personal business dealings. Wapu Sonk was involved in the NRL bid, but separately to he runs PNG's largest petrol company and it is alleged he used that position to personally profit and/or do deals with Chinese companies.
Unfortunately, and this is something the NRL and Aussie Govt already knows it has to deal with long-term, corruption is rife in PNG and you are going to have to deal with people who may have shady background.