The spike came from teh new variant. The initial lockdowns kept the country safe there for quite a while and restrictions had been lifted over the past few months. You are looking at the spike as though it was a major surge but you have to look at the left side of the graph and that even with the spike the numbers are extremely low.
I showed you Texas which is a state with about the same population of Australia with little to no restrictions to show you how many cases and deaths a truly non restricted place can suffer compared to Australia. So to see a bump in the chart and claim lockdowns don't work is simply looking at the shape and making a poor generalization.
To quote someone smart:
"Come on, dude. You're passing judgment purely on COVID stats.
It's not a simple equation."
The spike came because of the new variant, I agree. But either lockdowns work or they don't. And if there is a place where lockdowns were more severe than Australia, please show that place to me. And the point of the chart has nothing to do with a new variant. Despite massive lockdowns (as indicated in the chart) the virus still did what a virus does.
That is the only point.
If you want to discuss comparisons (which is where you went in the argument) then we can. But that isn't the same point as the chart was trying to make (that lockdowns don't do anything but >possibly< delay the virus response - but the virus is coming no matter what you lock down).