Yola does have a VOR, and they also have an ILS into there, its also an airport that you may do night landings at if you pay the $$$ and as we all know Governors can pull weight. Its Nigeria, 419d is how they play here remember?
Disclaimer, again, I don't know how much water the story holds, even though it came from one of his aids. First reports also stated he had died in the crash so take it for what its worth.