Yes, Aenima is definitely a goth band because most of their albums belong to the Ethereal Wave and Darkwave genres, which are among the core subgenres of goth music. Albums like Revolutions, Sentient, and Never Fragile are examples of their goth sound.
Some of the other goth artists that are similar to them are Isiphilon, Ostia, and Scarlet Leaves.
Aenima is located in Portugal, Almada, active in 1997 — 2007. You can find more information about Aenima on their GothDB band page.