Yes, Pink Turns Blue could be considered a goth band because they play Gothic Rock and Darkwave, which are among the core subgenres of goth music. Albums like Meta, Eremite, and Aerdt are examples of their goth sound.
Some of the other goth artists that are similar to them are The Cure and ACTORS.
Pink Turns Blue is located in Germany, Cologne, active in 1985 — 1994, 2004 — present. You can find more information about Pink Turns Blue on their GothDB band page.