My opinion is that he sometimes doesn't accurately remembers how he played, or let's say recorded his riffs. I did a video showing how to play this song - it's slightly different than his or your version but in my opnion comes closer to what i hear in the original recording. edit: I was wrong, just listened again to the original track and recognized the higher harmony.
Catfish are my favourite band and I know you to a lot of lessons on their songs. Please could you to red ! I can't find another tutorial for it on RU-vid anywhere
Can you redo Dunkelheit? It's Burzum's most popular song but the only tutorial(the one Varg himself has done) is a tad hard to follow and all the tabs I found online sounds wrong