Can you give a citation?
As an example, South Africa is basically engaged in a civil war with itself (22,000+ people die violent deaths).
Zimbabwean life expectancy fell by more than 20 years - more people die there. Zim is basically a civil war (which nobody would acknowledge). Eastern DRC - easily more than a thousand, the same with Sudan.
Also note that sub-Sahara Africa only has a population of 700 million. Asia has a population that is two to three times larger.
> The coup in niger was for an actual breach of democracy - the democratically elected president tried to overstay his term, and he was stopped by the military.
You are ignoring a few things - the ruling parties is becoming incredibly intertwined with government (i.e. it is not democratic anymore, even if they hold elections). Sure, it is a bit more stable - but I doubt that it is better.
There were also recent coups in Mauritania, Madagascar.