Those are definitely not all adventures. 205 and 8 are not....and 212 takes place in the planes (lots of adventures in Dungeon do), but really has no PS connection.From the Collector's Guide post...
Dungeon 55, p18, Umbra (September 1995)
Dungeon 60, p32, Nemesis (July 1996)
Dungeon 205, The Demonomicon of Iggwilv: Shemeshka the Marauder (August 2012)
Dungeon 208, p43, Demonomicon of Iggwilv: Fraz-Urb'luu, Prince of Deception (November 2012)
Dungeon 212, p15, Court of the Dark Prince (March 2013)
Though that poster mislabeled the Shemeshka adventure as Dungeon 204 when it's really in 205.