I noticed this question (10k-only) that was apparently deleted by Community more than five years after it was originally deleted, but no events (neither undeletion nor anything else) have occurred since the post was first deleted.
The revision history shows two consecutive "post deleted" events: one in July 2009, and the other in December 2014:
Interestingly, the deletion banner on the question itself only later shows the Community user's later deletion:
I checked the post's timeline, where the reason for the Community user deleting a post is usually listed if it wasn't as a result of the Roomba (e.g. was a negatively-scored post when the user's account was deleted, the user was destroyed, etc.). However, the relevant timeline entry lists some cryptic text, which I searched for and couldn't find the meaning of:
What does "help post localization backfill" mean, and why is there this extra "post deleted" event?