This will probably sound like a paranoid lunatics question, so I apologize in advance.
this is not paranoid question, it is just an uninformed one.
People often use the FUD argument that "Bitcoin is centralized by Chinese market", which is debunked by "Well, other countries can setup miners, too, to balance the power!"
this is an FUD not because of what it says but because of what it doesn't say and just implies.
the thing is that despite popular believe (due to previous FUDs) there isn't that much hashrate located in China. which means your question no longer makes any sense.
also should keep in mind that China doesn't even need 51% of the hash rate
actually in order to successfully continue a 51% attack you need a lot more hashrate than 51%, something closer to 70% is needed. otherwise theoretically you can perform the attack with a much less hashrate too and get lucky to get a random block replaced but not be able to grow it any longer and definitely not be able to reverse a high value transaction that needs more than 3 confirmation.