I don't know Gorka but I did investigate Terry Callier who also claimed to be "new folk" because he was described as bringing a jazz feel to traditional folk music. I must say I was disappointed. A pleasant enough voice and guitar backing but he did everything so slooooowly that everything sounded the same and dirge-like. IMNSHO.
But then I'm not a folkie, just an ignorant old git who likes a little folk to leaven the jazz & blues occasionally.
RtS