So what could this be? My theory, which I just made up, is that there's a unit on demographic displacement in American history, which is a pretty well known historical fact, and they decided it sounded like "Great Replacement Theory", which it does.

And why am I allowed to just make up this theory? (We usually have higher standards than that!)

Because they won't say what the "triggering content" is, just like they never say what an alleged slur someone said is, or won't tell you what joke someone made that was allegedly transphobic.

We're now free to assume what we like. And the reality is likely to be even stupider.