Articles about two countries cannot be more true than the lived experience of actual residents of Africa. I am Kenyan as well, that article describes something very specific to individual communities in some countries in West Africa, it is foreign to me. The largest expense of funerals that I've experienced in my life is usually paying the medical expenses of the deceased (if the person had been ill for a long time) and feeding the funeral attendees (we do usually get a huge crowd and they generally get lunch).

Another data point: maybe 35-40% of people in Africa identify as Muslim. They usually bury people the same day they die or at worst the next day, and there is no elaborate coffin, usually just a cloth sheet.