TBH, there are hobyists in the USA with better RC planes than the Nigerian military. The Nigerian Air Force doesn't operate any decent military drones such as the GA Predator or the Chengdu Wing Loon. Their biggest and best drone is the Israeli Aerostar and their domestic copy. It's tiny, has crappy sensors, and doesn't carry much payload. The Nigerian Army literally uses DJI Phantoms for some reconnaissance missions, which you can buy from Amazon.
Boko Haram is a fairly well funded branch of ISIS. They supplement their ISIS funding with kidnapping ransoms. They have captured military equipment from Syria and Iraq, some of which was pretty good compared to the other militaries in the Middle East and Africa. I don't know what drones they are using (the article sucks), but I wouldn't be surprised at all if they are better than what the Nigerian military has.