Since Xi Jing Ping's rise to leadership of the Communist Party, many Communist Party members have been massacred (thousands were executed, removed from party posts, and denied access to public facilities). Many consider this to be genocide and an act of slaughtering pro-democracy political opponents (Deng Xiao Ping's era, China was very close to the United States).
Although China appears strict on corruption, this doesn't mean it doesn't play dirty. In fact, to secure infrastructure projects, Chinese private sector companies actively bribe government officials. China is extremely tough on domestic bribe-takers (corruption is seen as an existential threat to the party-state, maximum deterrence, discipline, severe penalties, even the death penalty. However, it is weak in taking action against Chinese bribe-takers abroad, which is legally prohibited, but enforcement is weak, jurisdiction is narrow, and projects are in an ecosystem that encourages “grease payments.” As long as China has not become a party to the OECD Anti-Bribery Convention and has not established a pattern of routine prosecution of foreign cases, this gap will persist.
In fact, internally China is quite tough on corruption since it endangers the party-state, but it does not mean that they are not pretty dirty on the international stage. Bribery and grease payments continue to occur in international business in general and most notably in infrastructure projects overseas. Therefore, domestic policies might establish harmony and order at home, but that does not necessarily mean that China is not corrupt or fraudulent in trading internationally. China has the internal discipline that Africa or any other place may learn but global business is full of risks regardless of the country.