I honestly see it going the other way. Deepfakes being used to create fake material that falsely incriminates someone. So if they have the biometrics of an account on file already, they would match a fake video circulating the service to that account and presto you are on a watch list.
Now that is an interesting thought. They could incriminate party members and government officials to sow distrust in the ranks.
Having seen though how certain groups of the population have been dealt with in China does make me wonder if they would not just round everyone up and send them for “re-education”.
I'm sure the state will do so happily to politically assassinate officials that don't fall in line, but imagine if the people started doing the same to the Big Dogs, like to jinping himself. The possibilities are exciting ...