That is because he is just here to troll US, not because he believes in China.
There are two reasons to emigrate...
1. Where you are at is simply too terrible to live. Anywhere else, even if you just heard of it, must be better. Canada is not like that. Canada is still very nice and probably among the nicest country and society in the world.
2. That 'other' country is simply too attractive to ignore. While much of this is perception, it is valid to you and you can ignore anyone else's opinion. Helen Mirren, grand dame of the theater and the big screen, became US citizen. Steve Hilton (Fox News) was reasonably wealthy and politically prominent in Britain before he became US citizen. Neither of them was 'oppressed' or living in poverty before they came to the US. There are plenty like Mirren and Hilton who chose to become US citizens even though they had no observable reasons as to why they would abandon their birth countries and chose America.
Our troll here fits neither. Could be because he is just a teenager still under his parents' custody and pretending to be an adult on the internet. But if he is serious enough about China, he would have made all efforts to live in China, perhaps even have cosmetic surgeries to look Chinese. But I doubt that he is anything more than a troll.