That largely just seems like a pop density map of those people who are likely on the English internet. Or in other words: the shows the base rate of UFO sightings is relatively location independent
Much more people on the English internet, including a huge number of Indians. But the map does seem to correlate well with the population density of Anglo-Americans in particular. Which is telling me that this is not a map of "all UFO sightings" at all and is massively biased towards sightings by Western English-speaking people.