It is a local airport direction at AYQ and I believe ASP. The history is that lots of tourists like taking the photo's and it was difficult to marshall pax safely and actually board the aircraft in a timely manner. 1 Marshaller vs 115 pax. I know this because we were training staff from AYQ and they couldnt believe that we allow photo's at our port.
A pretty big overkill-why not use tensa barriers or the like and let the passengers take the pictures-Great free advertising