It is interesting that no one seems to be giving Australia any hope.
I think the lower scoring pitches have brought Australia right into semi-final contention. No team benefits more from lower scoring matches than Australia who, unless the openers go wild, will not score 180+ on a good wicket. They have a bowling attack that can contain sides well. Zampa is an underated T20 bowler. He gets no credit but has an effective record and has done well so far. Career economy of 6.84 is very good.