Practically speaking European construction aid, the introduction of modern(ish) medicine/agriculture techniques and institution building has raised the standard of living of millions of Africans and vastly increased their population, colonial warfare and measures like Apartheid were a small price to pay for that.
IMO the issue is how will this develop? The amount of power China has over them from being owed this much is almost unlimited if they play their cards right. I don't know if shit like Leopold's Congo can happen in the age of smartphones, but I wouldn't put it past the CCP to try. And even further along, what happens if/when the Chinks lose interest? The Europeans pulled out hastily when imperialism stopped being fashionable and the results ranged from endemic corruption and anomie to literal race wars .