Gun violence in Australia was on a steady decline before the buyback and it seems to be maintaining the same trajectory “down” regardless of what laws some self serving politician tries to pass.
Australian States,in general, have had strict gun laws for many years.
In Western Australia,they had a "gun amnesty" period when I was a kid in the 1950s,where people could bring in unlicensed firearms,& either license them,or have them disposed of.
In the same state,at least from the 1960s.if you wanted to own & register a Rifle,you needed to have a certificate from a Property owner giving you permission to shoot on his property.
Of course,if you were a member of a target shooting association,they normally have their own shooting range,so that was covered.
Kangaroo shooting was a popular pastime among some folks.
The country people knew what they were doing,& would go out with a bolt action 0.22" rifle,bag a couple of 'roos & take them home to eat.
Idiots from the city would load up their cars with grog & firearms,"go bush" & shoot up roadside signs & the like,whilst driving drunk.
It never occurred to them that they were shooting into peoples farms,endangering their livestock,& families.
All completely illegal,but they got away with it if the farmer didn't catch them,or they didn't drive into a tree.
This sort of behaviour made farmers very reluctant to let people shoot on their properties,so gun ownership started to drop off in WA & other States with similar laws.
At least in WA,illegal firearms were fairly rare,& most gun injuries & deaths were from legal rifles.
Except among serious Sporting Shooters,gun ownership fell away,with an accompanying decrease in firearm injuries.
Queensland stood out among the States with quite easy going gun laws.
Around the early 1990s,there were reports that gun fanciers in that State were acquiring large numbers of modern
semi-automatic weapons,including comments from various senior Law Enforcement people.
Ultimately,though,the "buyback" was precipitated by a mass shooting in Tasmania,& gun laws around Australia were tightened up at the same time.
Guns in Australia were traditionally regarded as "tools" to shoot game animals for food,protect stock from predators, for
competitive shooting,& for war,& never gained the mystique they enjoy in the USA.
Gun fanciers in North America,for reasons of their own,tend to misrepresent the difference in strictness before & after the "buyback".
We did not go from a USA type system to a "No guns at all".
An already fairly strictly regulated system was tightened up a bit.
Looking back to the nonsense the OP was laughing about,the young lady had probably read one of the "reports" generated by some right wing halfwit in the USA which have been variously accredited to both our current PM,the two previous ones & the PM of France!