Yes, Hada is definitely a goth band because most of their albums belong to the Darkwave and Ethereal Wave genres, which are among the core subgenres of goth music. Albums like Abrahadabra and In The Heart Of An Endless Winter are examples of their goth sound.
One of the other goth artists that is similar to them is Dead Can Dance.
Hada is located in Greece, Athens, active in 2018 — present. You can find more information about Hada on their GothDB band page.