I remember someone made a joke about how there were pandemics in 1920, 1820 and 1720, and another user commented that there is a weird flu in some Chinese city. This was either in the last week of 2019 or very early 2020.

Yes I remember a friend who lives in Hong Kong posting a news article (from a Chinese news source) describing a "mystery pneumonia" the first or second week of December 2019. He hypothesized that it was because of bushmeat. I think the news article got scrubbed. I wish I had saved it.