I noticed on Retrocomputing that self-deleted posts do not show up in the Deleted section of the 10k Tools. Why is this? It seems like it would be useful to have all deleted posts show up in this list.
I agree. Moderators can access a list of self-deleted posts, but as a moderator I want the community to be watching over deletions, not just mods. 10k users would be able to see those posts if they had the links, and we give them a tool to review other deletions. So why not include self-deletions in the 10k deleted-posts list? I don't see a way that this can hurt, and it can help the community share the moderation work.
I assume Stack Exchange does not want to "shame" users.
Suppose one wrote a REALLY dumb question or answer, then realised it's bad seconds after posting, and deleted it. While it will always be there, visible to 10k users who happen to visit the question, I think it's better not to spread the shame.
So, I do agree with this behavior.
However, with some tweaks it can be made even better:
If the post was self deleted X hours after being posted, do show it in the 10k tools.
If the post had at least one upvote when deleted, do show it in the 10k tools.
This way we can monitor possible good posts being self deleted.