First, "contemporary Chinese Marxism" is not within the CPC but exists as a dissident intellectual trend. You've probably heard of the "New Left" in China. Much of it is not Marxism, though, but reformism and liberalism dressed in nostalgia for the the solidarity of the Mao era. Central to this is the idea that Marxism-Leninism is "dogmatic" and Mao made his mistakes (like the excesses of the Cultural Revolution, which all liberal intellectuals in China love to brood over and compare to modern "successful" China) because of this.