This is probably explainable by correlations between political leanings and population density, but that's beside the point: Is there real evidence for the claim you are making, or does it just fit in conveniently with your worldview and narrative?
The US does particularly badly with the more restrictive measures, and has a large segment of the population that denies covid is real and/or anything to worry about. Connecting those dots isn't THAT much of a leap, in the context of an internet forum...
I don't think he's trying to point out a cold hard fact as much as a trend.
Australia has a right wing popularist government but has coped well. Urban areas would always be worst hit, it's a communicable disease.
So there will never be a cold hard law to this.
I find the dishonesty the most annoying. My current right wing popularise government lacks the bravery to be honest and say "fuck it". So they're pretending to do things. Then immediately breaking the rules themselves very publically.
People get the message: "this is serious, wink wink, nudge nudge"