I thought that.. but the date he got the FoS hasn't changed.. that would mean he had to have gotten both hidden appearances the same day.. which is highly unlikely.
Of course there is a chance but since all my assumptions are based on unknowns I'm going with the balance of probability anyway
EDIT: to clarify.. when people on wow head first mentioned he had it, we were looking at his recent history to work out what he did (hence people getting the shoulder enchant to get a gem bag) which showed at what point he got the FoS.. I wish I had taken a screenshot of it as the history only goes back so far and you can't actually see it in his activity history any more. So what I'm saying is the date of the FoS ties in with what we saw originally.. it hasn't changed so I doubt he has it as a result of getting the other appearance..