That's just a left wing comedy show.
Here's another point of view on the Australia gun ban. I believe there's even a documentary on it somewhere.
A few things about this:
Gun ownership was never a constitutional right in Australia. Regardless, I don't see how gun collectors having their hobby ruined trumps public safety.
Guns are not completely illegal in Australia. There are still many exemptions that let non-police or military personnel own them
Statistics don't have a bias. After searching through many different sources, I can't find anything resembling what they show in this video. Everything shows gun crime decreasing significantly since the ban. And this of course includes, to reflect the original purpose of the ban, mass shootings, which has been reduced to none. This is why I prefer to get my information from reputable sources rather than believing whatever a video is saying.
And left-wing comedy show or not, they consistently bring up great points and have a stronger reputation for truth than most real news shows. If someone has a strong argument, the argument isn't diminished because they made a joke with it.