Gaza had its internet cut off and still managed to get footage out there. And that's just from the Palestinian side. Israelis were bragging about their crimes all over social media in plain terms (like "Hahaha I just shot a little kid in front of its parents," not even trying to hide it in coded language).

So either China has the most sophisticated spying and censorship apparatus ever conceived of that's capable of erasing footage instantaneously anywhere in the world, or there isn't a genocide.