The music of Ildjarn cannot be understood intellectually. It succeeds due to the sheer knuckleheadedness and honesty of it's execution. The sounds you hear therefore are beyond the concepts of intention or accuracy. It is pure spirit. A psychoacoustic nightmare.
At any rate, with all the new activity lately, I hope he does make a return to music. Hardangervidda was one of my all time favourites, but it would also be cool to see an expansion on the Sort Vokter sound or the newer tracks from Ildjarn-Nidhogg.