I did not use any data of this service. I wrote, it just indicates visually where areas could be inhabitated. So you put GHSL data into your own GIS (like QGIS), look around where is light and than check osm if there is really something inhabitated. Its just coincidentally picked by flashy areas. Its called adventure to find something what is not on the map. Is that wrong just to explore with other open data your next place to map? How do you pick where you map?