is it? outside of autopsies, i think i have only ever seen it used as a synonym for "incident report". i dont think ive ever associated the term specifically with the end of a project.
e.g. cloudflare uses the tag for all of their incident reports (https://blog.cloudflare.com/tag/post-mortem/), not as a signal that they are closing shop
That's what a post-mortem implies to me in the tech industry. A thing happened, it's over now, here are the lessons we learned to take into the future.
I'm aware about the use in incident reports of course, but then you still don't call it "<project name> Post-Mortem" but use a more specific namespace.
People should stop using it as a synonym, then. The Latin effectively means "after death", meaning its a poor synonym for "what happened wrong recently".
language evolves over time
post mortem is even in dictionaries (meriam, oxford, american heritage) as "an analysis or review of a finished event"