1. Separate post: to let all users be aware of technical issue on this site’s activity log.
2. The co-admin asked me if I deleted any posts on January 10 as it shows a post trashed by @dancinglightofgrace
3. I told him I didn’t. I had only trashed drafts.
4. My activity log also shows posts trashed by @sandeept252 about which he never informed me.
5. He told me it was his own drafts.
6. We both deleted drafts. I deleted drafts by other users after notifying tyem.
7. Technically: a draft deleted is registered as post deleted.
I hope we need not contact WordPress about this anymore.