In my opinion, no, it is not possible to separate the art from the artist.
Depending on one's view either the artist's mind is coming up with these things, which gives us a view into their mental or spiritual state, or the artist is directly channeling demonic forces. Either way, not good. To quote the Bible "you will know them by their fruits".
I don't know you, but (also, just in my opinion) i think the fact that you are questioning this means you may feel there's something off about continuing to listen to this kind of music.
Very interesting. I previously thought an artist could be separate as the artist can put on an act, and the act is not really the artist's true nature. I thought an artist could put on an act like an actor does.
I thought some artists just act crazy to make themselves look extreme, cool, hardcore, etc.
But no, most black metal artists in particular are serious about their dark occult (other occult paths like Set)/Satanic/Luciferian beliefs. Some are not serious but most are.
You are indeed correct in saying that the art comes from the artist's mind, and that whatever the artist has put out is a reflection of the artist's mental and/or spiritual state.
Mind you, for all Satanic bands in all subgenres of metal (mostly black metal and some death metal ones), they do indeed study the scripture, in order to intentionally sing/make music about the inverse.
Black metal, death metal and their subgenres are my favourite music genres that I had been listening to for 15 years. I decided to analyze the content of these genres because I realized it's not all "just shock value", to offend and worry metalheads' parents. This music is not meant to be "just entertainment". This music has powerful dark occult messages and themes that may have an affect on fans/listeners.
Metal music, as with rock music, as with rap music, and even pop music (including kpop and jpop) is a psychological warfare campaign by the elites, against any of the masses who happen to like these music genres, the end goal being degeneracy in the form of careless casual promiscuous sex (putting yourself at risk of stds and destroying the neurochemical pair bonding ability, drug use of various hard drugs and hard liquor, and getting into the occult without realizing it, all for depopulation, destroying the family unit and their other agendas).
I'm not a Christian, I'm a deist, but one of the elites' goals is to completely destroy Christianity. Knowing this goal in mind, you'll realize that rock and metal music were created to try to brainwash the masses into going against and abandoning Christianity, and to go into the left hand path, whatever that left hand path may be.
Rock and metal are created methods, in which the elites try to reach this goal of destroying Christianity, and to try to get the masses into the occult so they can be primed to follow the planned one-world-Luciferian religion.
I was just looking at any word-concept connections the other day, there are lots of word-concepts in all of the Luciferian Ashkenazi-and-shabbos goy controlled media, also and especially with gematria.
In biology, heavy metals are toxic to all classes of neurons. Could the elite creators of rock and heavy metal music, where this all started, could have meant with the genre name "heavy metal", that it (the music) is neurotoxic to the brain?