In the article it’s noted that the digital camera couldn’t handle the fine dust and sand of Sudan, whereas the film camera did. Are there digital cameras can handle such difficult environmental conditions?
However, medium format cameras are the best you can get for still image quality while still having something you can reasonably call "handheld", which is likely why he chose one. Also, this Mamiya (like most film MF cameras) is massively cheaper than a nikon d5, which means you care less about risk from dust damage etc.
I guess sandstorms must be harder for the camera?