Considering that the Australian economy is based on digging and has an economic complexity just below Uganda[0], most of that damage was unavoidable anyway.
It doesn't seem to take into account internal economies, but I don't know how we fare there.
But if you subtracted these industries from Australia, I would expect there to be more knowledge and technology industry remaining than in some of the countries with a higher ECI. So if ECI is not normalised by total economic output, I would be surprised.
Normalising by economic output makes it a bit of a misleading metric. Australia could have world-class knowledge and tech sectors (they don't, but they could), and yet ECI would be low just because some low-complexity sector was booming.
Not normalising at all is pretty fraught too though. I guess it has the potential to mislead in both cases.
$25,000 per person is a huge amount of money, far greater than for any national scheme, ever. Probably approaching Australia's expenditure for a world war or major international conflict.
Keep in mind that currently in Europe - there is very limited excess mortality. For example in Belgium right now, there are less excess deaths than from a heatwave in August:
https://www.euromomo.eu/graphs-and-maps/#z-scores-by-country
Sweden and other non-lockdown countries are already back to normal. The only thing preventing normality is politicians who insist on lockdowns for a virus which is currently not causing excess deaths beyond what we would expect from regular influenza.
Monetarily, it's no different than any other medical expenditure. Would you spend 25k for an extra year of normal life? What about if you're 20-30?
Colour me jealous.
Would you pay $25,000 in order to have a 1 in 1,666 chance of living an extra few months when you are 80 years old?
No one would take those odds - but it has been forced on the population.
I live in Denmark, with arguably more restrictions than Sweden. I'd happily sacrifice 25k in future lifetime earnings to have 2020 back. (BTW, as a startup founder, the possible costs of COVID may wind up being far more disastrous to my lifetime earnings)