That's the argument of
Gerald Prunier's book, Darfur: The Ambiguous Genocide, reviewed by Yehudit Ronen in Middle East Quarterly. Instead, it is more accurate to call the situation mass murder in the midst of civil war:
Prunier claims that the killing in Darfur should not be seen as genocide, since the aims of the Sudanese government were not to eradicate a people but rather to carry out the brutal suppression of what was seen as an existential threat. Whatever term one uses, however, the carnage and misery unleashed by Khartoum and its Janjaweed cohorts remains just as horrific.