I think the content of the question is irrelevant.
It generally isn't a good look for an interviewee to go after the questioner, remember this interview?:
All Abbott needed to do was refute her claim and move on. There wasn't any need to start throwing questions back at her.
Gotta disagree - to call a Government corrupt based on the actions of one man (whose actions were deemed not to be corrupt by the counsel assisting the inquiry) is exactly what Abbott says it was - a smear. And he has every right to ask her on what basis she is making the accusation. We have fact checkers all over the media, parsing every word coming out a politician's mouths. Good on the PM for applying the same standards to the media.
Regards
S. Pete