I suspect "yesterday" is the clue to this riddle.
Posts deleted are removed automatically 24 hours later, yes?
If you, @MitchellModel, deleted the post, it is not immediately removed -- only after 24 hours.
Also, there are two private or limited-access categories on this forum.
Perhaps the word "private" in the message is to cover that possibility.
A guess; I don't know.
So, enough suspense!
What was your original post?