The description to case file 8.1 is “This is, at best, an elliptical clue, but given the discussion about Orthus in the forum, maybe you can make something of it in your solution to 8A. Once you have solved that you will get a hint for 8B in the reply. Good luck, Jodie”
The only posts I saw about Orthus were after the case file was posted, so which discussion is it referring to?
Harry, Jodie and the elves get to read the forum before it is posted, and sometimes delay publication to keep things interesting. So: hidden, but only temporarily.