I think the numbers are within margin if you measure what actually matters; urbanization. The huge swaths of empty forests up north in Sweden makes the 5 times number look ridiculous but doesn't carry any meaning.

Looking at urbanization:

Denmark: 87.5% [0]

Sweden: 87.4% [1]

Another statistic is Copenhagen Metropolitan area compared to Stockholm, which both is about 2.5 million. Though Copenhagen jumps to 4 million if you go by the Öresund region including parts of Sweden. [2]

[0]: https://www.statista.com/statistics/455812/urbanization-in-d...

[1]: https://www.statista.com/statistics/455935/urbanization-in-s...

[2]: https://en.wikipedia.org/wiki/%C3%98resund_Region