Yes, Miazma could be considered a goth artist because they play Gothic Rock, which is a core subgenre of goth music. Albums like Walk The Wire, Dollar Rush (10th Anniversary Edition), and Miazma are examples of their goth sound.
Some of the other goth artists that are similar to them are The Sisters of Mercy and Angels of Liberty.
Miazma is located in Sweden, active in 1999 — present. You can find more information about Miazma on their GothDB band page.