Yeah, China has a long tradition in ‘supporting’ Sudan and its government (Sudan was the first African country to recognize the People’s Republic of China in 1959). In the 2000s Beijing even sent weapons during the Darfur crisis, as one report back then says (opens pdf):

The genocide in Darfur is not an unknown problem to those in power in China. However, it is clear the Chinese government will do whatever it takes to support and maintain China’s economic growth. Because the Chinese government is focused on this one goal, it is more willing to turn a blind eye to corruption and oppression within the Sudanese regime.