Investigating this question about a user who deletes his own questions improperly, I opened the timeline for the example question. But, as you can see, it doesn't show any deletions or undeletions!
According to the kickoff post about the Timeline View, the timeline is supposed to include
- initial question ask
- closure, deletion, reopen, undelete, etc
And, the question does show as deleted and undeleted in the revision history:
Unfortunately, the question revision-history is not as useful as the question-and-answer timeline, for things like this -- especially since terms like "1 hour ago", "2 hours ago", etc. are not precise enough when comparing two or more pages.
Please fix the timeline view to (once again) show when a question is deleted and/or undeleted.