Your inclusion of China is not correct. China comes in at 88th place. I think you confused the population density of Macao and Hong Kong with the entire country. I believe that the Vatican is next on the list - this is the source used https://statisticstimes.com/demographics/countries-by-population-density.php#:~:text=List%20of%20countries%20by%20population%20density&text=Population%20density%20is%20calculated%20as,population%20only%20numbers%20in%20thousands.