They can be westerners and hate their own countries and societies, plenty of those, actually.
And I started reading the article, but I had to stop here, because the authors themselves said they didn't have the numbers to validate their opinions.
"We do not know for sure what India’s pre-colonial mortality rate was, but if we assume it was similar to that of England in the 16th and 17th centuries (27.18 deaths per 1,000 people), we find that 165 million excess deaths occurred in India during the period from 1881 to 1920."