Neither the Senator nor Pfizer Seem to Know that the Senator is Part of the Australian Government

Pfizer gets a less than thorough grilling by the Australian senator who seems to have forgotten to some degree that he is part of the Australian government. It seems like what the head of Pfizer is insisting upon here is not a good enough reason not to disclose the agreements. After all, it is the Australian government who is asking him to disclose the information that he's claiming is between his company and the Australian government. What's he hiding?