Yes, Caelum Bliss is definitely a goth band because most of their albums belong to the Ethereal Wave genre, which is a core subgenre of goth music. Albums like Caelum Bliss, Caelum Bliss, and A New Rain Of Sorrow are examples of their goth sound.
Some of the other goth artists that are similar to them are Claire Voyant and Siddal.
Caelum Bliss is located in United States, Michigan, Detroit, active in 1993 — 1999. You can find more information about Caelum Bliss on their GothDB band page.