I think they mention they located the mountains not from the ridge outline, but from a tip-off they received about where it all happened, and then they corrobor

I think they mention they located the mountains not from the ridge outline, but from a tip-off they received about where it all happened, and then they corroborated that tip against the ridge outline, building placement, roads, etc. > After a tip off from a Cameroonian source, we found an exact match for that ridge line on Google Earth