As far as I know, Mongol (I assume this is the word you meant to use) invasions of China were military actions rather than genocides. However, I will need to look into it further.
As indicated in the instructions, this list seems to be subject to serious definitional inconsistencies. It's not too hard to Google up professional papers arguing that the Khmer Rouge atrocities weren't genocide because international definitions thereof deliberately rule out killings because of politics or class. And it is hard to see why if Cambodia *is* listed, events like the Great Leap Forward wouldn't be.
Whilst genocide is typically rooted in religious conflict, this is not always the case. The United Nations classifies the Khmer Rouge as a genocide, despite the political motivation. In terms of the Great Leap Forward, the event lacks one of the two primary characteristics required for it to be considered a genocide: the intentional targeting of a specific group. Whilst the Great Leap Forward was an awful period of history, Mao's campaign was technically not a genocide. The Cambodian Genocide, however, was intentional. I hope this clarifies everything.