They are all warned not to post pics taken while they are on set, etc. because of potential background "spoilers" being divulged. So yes, old pic.
In the past, Deidre Hall posted a pic of her and Greg Vaughan, he was wearing a priest collar, thus it "spoiled" the fact that Eric was coming to Salem as a priest. In makeup room, mirror will reflect chart with cast for that day, thus spoiling new arrivals... or the TV shows some scene we have not viewed yet. One pic long ago, showed Vivian way in back.....and her return thus was "spoiled". The show really clamps down on stuff now.