Excellent bit of data, apart from.................
Macau is not a country, but an administrative area of China, as is Hong Kong, which to an extent distorts the population density figures.
Same with the UK, and Gibraltar, and Bermuda, take those into account, the UK density figures increase slightly.
This is a highly dubious chart to use in this context, unless you combine the areas of any country together.
It would be like excluding the figures from Rome (the vatican city) from the rest of Italy, or Catalonia from Spain.
How would it work with Cyprus, separate density figures for Turkish Cyprus, and Greek Cyprus.
What about the countries with areas separated by a "military no go zone" such as North & south Korea, that would be interesting, a defector crosses into the no go zone with covid, and dies before he gets to the other side, that would mean the no go zone has a 100% mortality rate, but if he has survived it in his encounter, the no go zone has a 100% survival rate...........................