The relationship itself wasn't the corrupt part, it was the fact that he had told her about how he was going to be making money on land deals and using his position as a politician to secure it. The Qantas Board and CEO are not part of the Australian Government public sector.
The National Anti-Corruption Commission (NACC) is an independent Australian Government agency that detects, investigates and reports on serious or systemic corrupt conduct in the Australian Government public sector.
A political decision is not always a corrupt decision. The NACC has had 1000 reports of corruption, it is only investigating 4. From what i can tell the NACC will have no more powers than a Senate Inquiry. Off target you think, lets wait and see