Australia went all stupid and did what TSwizzle and Metaphor were begging for, and went from 300k cases in December to currently 5.5 million cases today. The TSwizzles and Metaphors were all about opening the flood gates while the river was above flood stage, and success and freedom. Thankfully, Omicron isn't as deadly, so the Aussies were exposed to a lesser form of the virus (so less than 6000 deaths) than Delta which seemed just as good to expose people to according to our Pro-Covid posters.
Which goes to show that even if someone gets it right, there will be others demanding improvement (read failure).
I don't know how much wrongness you can pack into a single post, but you've certainly given it your all.
That page shows 245,000 currently active cases and 3.25m cases ever, not "5.5 million cases today", which would be 1/5 of the population of Australia.
I must have transposed the first number in deaths with the cases. That definitely in error. Also in error is that 5.5 million cases today being 1/5 of the population... while ignoring that 3.25 million is still around 1 in 10.
Here are the correct numbers for Australia:
From 25/01/2020 to 01/12/2021 (676 days) total Covid cases rose from 4 to 211,654. That is an average of 313 cases per day.
From 01/12/2021 to 20/03/2022 (109 days) total Covid cases rose from 211,654 to 3,903,113. That is an average of 33,867 cases per day.
The ratio of daily cases between those two periods is 1:117
From 01/03/2020 to 01/12/2021 (640 days) total Covid deaths rose from 1 to 2011. That is an average of 3.1 deaths per day.
From 01/12/2021 to 20/03/2022 (109 days) total Covid deaths rose from 2011 to 5,728. That is an average of 34 deaths per day.
The ratio of daily deaths between those two periods is 1:17
A word of caution: How much the increase in cases and deaths is due to "opening the flood gates" cannot be determined from those calculations. The Omicron strain, which hit Australia around the 13th of December is said to be significantly more contagious and less deadly, while the Australian states and territories relaxed or abolished Covid-related restrictions to different extents and at different points in time. We don't have control groups to get a reasonably close estimate, and even coming up with a vaguely approximate one would take hours of locating, collating and analysing the necessary data.