They use the word settlers within quotes, preferring to call them Turkish immigrants instead, while they do not use quotes for the "trnc"
Piratis,
That they do or do not use scare quotes around certain words or phrases does not imply anything specific point about the population data. My reading of the PRIO document is that immigrant is used as the general category, whilst settler - which is not an internationally recognised classification term in population studies - is used loosely to designate those who seem to stay, i.e, settle. But 'settle' is not a commonly accepted term, there being important close synonyms such as permanent resident, temporary resident, migrant worker, and so on. A migrant worker for example might actually be resident in country for years or decades, leaving the country of work just once a year or less.
Population data collections tries to classify according to the current distribution and actual location or position of people. Thus temporary resident is preferred over 'settler' not because of some nefarious political scheming, but because 'settler' refers to a motivating intention of a person and not the current location or position of a person. Population data is indifferent to people's intentions or motivatons, that's not what is being measured !