Yes, The Preachers Of Twilight is definitely a goth band because most of their albums belong to the Gothic Rock genre, which is a core subgenre of goth music. Albums like On The Razor Edge and Indigo Script are examples of their goth sound.
The Preachers Of Twilight is located in France, Paris, active in 1987 — 1989. You can find more information about The Preachers Of Twilight on their GothDB band page.