Why is 12 dead people in France from terrorism way more relevant than Boko Haram killing 2000 in Nigeria?
Plus, stuff like that happens all the time in parts of Africa, while armed militants attacking people in France is not a common occurrence. Also, after the attacks in France a lot of people were trying to push the "Islam is a religion of peace" narrative, and having news of mass killings by an Islamist group wouldn't support that.
But at the end of the day, it should definitely be getting more coverage than it is, as it's part of a larger problem that is only going to get worse in a number of countries from north Africa to south Asia.