Hamish McKenzie Killed Someone is satire, and as such, does not constitute libel.
“Hamish McKenzie killed someone” is a “cruel and unfair” “attack on an individual,” which consists of “writing about someone unfavorably, even repeatedly.” As such, it is explicitly protected under Substack’s anti-harassment policy, as set forth by Hamish McKenzie.
In a separate statement, which in no way reflects on the previous statement that Hamish McKenzie killed someone, here are the Trevor Project’s most recent statistics on suicide among transgender youth.