It's definitely getting closer to that point - for example winnie the pooh is a popular meme used to make fun of uncle Xi but it's hard to police given that it's a children's cartoon. It hasn't stopped the aggressive censoring of pictures of winnie the pooh (no joke) but it has definitely presented a challenge. Using vague historical anecdotes and rarely used imagery is a traditional Chinese mode of communication - in modern days you can see it in action via the aggressively close reading people do of CCP mouthpiece newspapers - the use of certain terms signal a greater ideological shift which people will then try to adapt to/guess at. Personally I'm curious about how this mode of communication will evolve given the current development of automated policing algorithms which will undoubtedly take context into account.