If the contributions of an editor are linked on a page, and that editor has contributions where the edit summary has been hidden by RevDel, Popups will show the diff anyway to administrators.
Narrative available at https://en.wikipedia.org/wiki/User_talk:MusikAnimal/Archive_32#RevDel.2Fpopups_bug
Example (you must be an en administrator to see it):
- Go to above user talk page
- Hover over 'contribs' in the user links for IP 22.214.171.124
- If you are not an administrator, the edit summary in Popups will say 'Hidden revision', as it should
- If you are an administrator, the edit summary is displayed in Popups