I made that map, and I'm not American. You can google "population density map Mallorca" and compare. I had the same assumption as you, so I googled it before publishing.
I used to go through a very similar process while booking longer stays for remote work trips. Now it gets even more complex as I have a baby, what means more parameters to consider.
Curating Airbnb listings ideal for work (desk, office chair, good internet) in interesting travel destination can be actually a good MVP. Something like crowdsourced (and cheaper) version of https://wander.com/