Look more like victims of burns than chemical weapons. Certainly wasn’t sarin or they’d be dead.
Mustard has causes serious skin burns. It’s particularly dangerous if inhaled as it burns lung tissue causing the victim to drown. Nerve agent fatalities usually show corpses in unusual positions due to death while seizing.
Agreed possible chemical burns from the peeling of the skin . possible exposure to corrosive industrial chemicals but also Mustard or Phosgene Oxime . Odd how you don’t hear/see any coughing/wheezing for breath in the video.