Today checked out of InterContinental Beichen in Beijing. The front desk person is new to the job and didn't know DCC, and the first Auth-Completion is DCCed. It shows "DCC Completion".

I asked for the manager, she ran the completion again. This time it shows "Auth Completion". The first completion was voided.

The machine is BoC. Now I've been 100% DCC-free at all hotels of Mainland China I've been to (around 30), in both cities of Beijing and Shanghai.