So, if I'm understanding your claim, you sent out a DNS packet (which doesn't identify your machine) inside China, then moved the computer outside of China, and it was blocked? There doesn't appear to be any mechanism for them to identify that computer if they wanted to block it, as the DNS packet only contains the IP address of the requester, which would have changed if you left China. Unless I'm misunderstanding your testing, I think you may have misinterpreted the results.
Biting the hand that feeds IT
