Indeed. It's anecdotal, but given the 1.3 billion people in China, I'm inclined to believe that this isn't a one-time case.
I can also confirm from personal experience that many, many educated Chinese locals are not aware of this portion of their history.
Even those whom I suspect may be aware of it seem to confine it to a cultural blindspot approaching wilful ignorance. It is something you simply _do not talk about_ in China.