Nigerian here; no we're not. Our economy is dismal and barely growing, yet the population is exploding. Poor (and I mean dirt-poor) people account for the majority of this population explosion, giving birth to offspring that'll face a lifetime of suffering.
I agree with the person you're replying to. African countries cause their own problems because they give birth to more people than their economic growth can cater to.
Here's a dire stat; Nigeria is currently about 224 million, and 63% are classified as "multidimensionally poor" [1]. Yet, we're expected to surpass China in population at year 2,100 [2].
How on earth do we expect those hundreds of millions more people to survive when we can't even take care of the ones we have? Answer is no one has a plan, but poorer people keep giving birth like flies and most of their offspring won't escape poverty. This is what sheer lack of education causes, coupled with excessive corruption that hinders economic growth.
1 - https://nigerianstat.gov.ng/news/78#:~:text=In%20Nigeria%2C%....
2 - https://africa.businessinsider.com/local/markets/nigeria-to-...