My guess is because it violates the HN Guidelines.
"Off-Topic: Most stories about politics, or crime,
or sports, or celebrities, unless they're evidence
of some interesting new phenomenon. Videos of
pratfalls or disasters, or cute animal pictures.
If they'd cover it on TV news, it's probably
off-topic. "
https://news.ycombinator.com/item?id=38691198 This post got flagged despite not being offtopic. An encyclopedia being accused of siding with perpetrators of genocide is not a small thing. Remember the coverage of Ukraine war here.