What does it mean to be a Marxist-Leninist? Answer this question first.
The population of China in 1949 was around 542 million, there were about 4.5 million CPC members at the time, around 0.83% of the population. Is every CPC member a Marxist-Leninist? How many people were MLs but not CPC members? Are you automatically ML if you support the CPC's policies? Are there MLs who aren't CPC members and don't believe in Marxism?
The population of China as of 2023 is about 1.41 billion, there are 99.185 million CPC members, around 7% of the population. The same questions asked above can be asked here. How many MLs are there in China?
Here's a long Chinese article about what it means to be a Marxist according to Mao Zedong: http://dangshi.people.com.cn/n/2013/1225/c85037-23943401.html