My understanding is that this presumption is wrong, but I don't have much to prove or disprove it either way.
Since she used Chinese characters, and I know that porn is illegal in China, it clicked in my brain that she was trying to avoid the Chinese censors by wearing a mask. I think I meant more "identification by the censors" than avoiding censorship itself, but that obviously didn't come through. I guess I figured she was some expat filming her adventures, and wanted to avoid the Chinese censors holding her family hostage or whatever. I don't know her history, so I was probably way off base and almost certainly made an inappropriate guess. Ah well, live and learn I guess.