Based on history, I don't doubt they spent 2 legs in Tanzania. Every African visit since season 17 has been the same: 2 legs in one country, and usually in the same general area, before moving on to the next continent.
17: Ghana
19: Malawi
20: Tanzania
22: Botswana
25: Morocco
26: Namibia
27: Zimbabwe (Well, 1 1/2. Zambia, but both Pit Stops were in Zimbabwe, and they really just border-hopped)
I guess because flights in Africa are significantly lacking compared to the rest of the world.