You may find something of interest in here: https://github.com/dessalines/essays/blob/master/README.md, or specifically here for things on Mao: https://github.com/dessalines/essays/blob/master/socialism_faq.md#on-mao-maoism-and-marxism-leninism-maoism-and-the-prc Dessalines is one of the creators of Lemmy.

You'd likely enjoy Inventing Reality. Its a good starting point.

Feel free to make another post asking specific questions, as people here are good for providing sources, etc.. I don't have the time right now. You can also search hexbear for things like "Mao" etc., though you may need to do it from www.hexbear.net as older posts may not be synced to your instance. There have been a lot of effort posts, reading lists, etc.. posted over the years. No one here "denies genocide" though.