> Are people really finding that out only now? I thought that this was generally accepted knowledge even in China, despite the constant fear and propaganda they live with.

Yes and no. You see, 2 decades ago probably half of my peers had that knowledge, that was when the internet was pretty much uncensored compared to how it is today. Over the years they get converted by the narrative and now it's probably 5% or even less that keeps a critical mind when reading anything from anywhere, which is, your know, all censored.