I take magic in general to be a manipulation of reality to the senses. Like making things seemingly appear out of air, or transforming substances, or telling somebody what they want to hear to amp them up, its all either trickery or legitimate manipulation of energy and what not. I'm being shallow but ill get to it here, black magic is essentially the evil use of magic, so say for example, trap music. People listen to the lyrics and the beat and it helps put, or keep, them in a mindset to got slide, the music itself is just that, but the energy it brings taps into the electricity of the mind and maintains or creates a whole new mindset. So what NLE here is doing is black magic because he is clearly lying and trying to manipulate people into thinking certain things to keep himself on their mind, activating that electricity, that energy, to continue his clout. That was pretty half assed cause I'm tired but just put 2 and 2 together and look at how esoteric, tribalistic, and committed to ritual the music industry is and you'll get it.