It's somewhat funny that Australia and the UK should be lumped in with the US. Australia's democracy has a ton of features that the US system completely lacks; independent electoral commission, preference voting, an ecosystem of parties that have real power outside the two major parties, parliamentary system instead of presidential, and many more.
I think a lot of alarm over recent scandals is just the ongoing tug of war between order and liberty. People who support more liberty or more order are always quick to argue that recent events extrapolate into infinite of whatever they think is bad. Very occasionally they are right, but mostly they are not.
Personally, I consider these sorts of studies as just noise. I can't trust any of their methods or conclusions when the researchers are all drawn from an intellectual monoculture that demands constant activism in favor of that monoculture.
> We aim to share reliable, up-to-date data on the state of civil society freedoms in all countries.
I guess you can be more democratic than you are free? Also it's an index that's bound to be imprecise to some degree. And one is by a consortium of human rights orgs, the other by a company.
[1] https://en.wikipedia.org/wiki/Democracy_Index