I suggest referring to this topic, as far as vetting of users goes
Did you visit the user’s profile and see if their communication was consistent with older posts?
Take a look Profile - bob715 - YoYoExpert
I’d say that’s consistent from my point of view, plus the posts align with interest in what you’re selling. Bear in mind I am a SUPER skeptical guy and I’ve … seen things … online, so for me to give it a isn’t something I do lightly.
However, as the seller, if you are not comfortable shipping to China I think that is 100% fine, and your call to make as the seller.