The comment said point blank that China does slavery and colonialism. For wars, they refer to recent history and that’s largely accurate in recent history (at least directly, indirectly they supply and offset Russian military presence), they haven’t used direct military force to get what they want yet. Largely because people would just give them pretty much whatever they wanted for economic considerations. Biggest potential place for things to boil over directly would be if they finally went into Taiwan.
This thread has been inundated with links to the commenters. Maybe you could take umbridge with the use of the word “communist”, but largely that’s a label they assert for themselves, and most criticism of them ignores the communist part, since that doesn’t even in theory align with Russia, and is beside the point even for China.