Ancient Rome: From Slaveholder to Supreme Emperor - Chapter 242

Okay so wasn’t he going to conquer the world ? Did he mean just europe ? I knew that while conqering china would be cool there was no way author would do that but what does he mean that he will return with his people to his homeland ? And how can he still enjoy slavery in the future when he introduces confucianism to the world witch is way to incopatible with slavery and how exactly does he intend to integrate with China and keap slavery ongoing ? Or will there be famous way of thinking that only Chinease counts for proper people and rest of the world are lesser people or barbarians so enslaving them is okay ?