The "Topic" bit generally gets added to a channel name when a music distributer (like DistroKid [2]) publishes music to youtube on behalf of a musician (in this case Alive Violet Molland), typically at the same time adding it to other streaming services.
Distrokid will let you publish an unlimited number of albums in this way for about $20 a year and then collects the revenue from any streaming on your behalf. I'm guessing the distributer may also register the audio with music rights organisations, which are presumably the source of the copyright claims.
The Wicca Moonlight video now has 4.4k downvotes.
[1] https://www.youtube.com/watch?v=-ThyLB6bakk [2] https://distrokid.com/