Let me preface this by saying that I read the interviews and watched the video and found them to be pretty pretentious. I'm also not crazy about the music. But, I think that these guys are being saddled with things they aren't actually saying. I didn't see anything about "fixing" black metal or "transcending" black metal. They're pretty consistent in talking about a transcendent "in the moment" experience.
It reminds me of interviews and books from the bop and free jazz era in the 50's following the big band era. If you've ever tried playing free jazz or improv music, you play whatever seems like it will work in the moment with minimal structure or forethought. The strange thing is, you will start to find that the musicians you are playing with will anticipate or have the same thoughts at the same time in terms of when to change, fills, dynamics, etc. It's a hard experience to explain, but it is pretty amazing when it works. The 50's beat writers talked about that experience as transcendence. In fact, the word "beat," though often thought to refer to rhythm, is rumored to have been coined by Jack Kerouac as a shortened form of "beatific," which is a communion with god. Kerouac was a french Catholic, which has a tradition of "beatific visions." He applied that idea to the Jazz music of his day, i.e. the musicians are having an experience that transcends the music.
I believe this band is saying the same thing. Essentially, they seem to be saying that black metal, like big band, is good music, but has a lot of structure and emphasis on technicality that can obscure some of the emotion. They are just stripping away some of the song structure aside from chord changes, as a means of getting a more emotional "in the moment" response. But instead of saying "We like to keep it loose because it's fun and it's cool when we're all on the same page" they said "Like, I wrote a manifesto, like."