The Suicide stuff is about protecting them from people who were promoting self harm. The unalive stuff is because of threats of violence. You can reference murder if it is say part of a news story or referencing something historical.

https://support.google.com/youtube/answer/6162278?hl=en#Harm...

Creators are being careful don't want their video demonetised because once it gets the yellow flag, even if it is removed later they've lost the majority of monetisation.

The problem with providing direct proof of this is that YouTube moves the goalposts quite often and their auto moderation system is very inconsistent.