Here is something that shocked me to find. The song... Yes, that song. The song mentioned in >>4937. younger me had archived it on a usb stick with a bunch of oldish stuff. It is utterly freaky to hear again. A channel matching the name does exist and it indeed appears to have been deleted, as there is no videos uploaded to it any more and he has changed the name (though he cannot change the ULR).
https://www.youtube.com/user/Somberguy20/

The song fits the style I described. Perhaps it's a bit basic but I hope you (and y'all other lurkers and sometimes posters) can see why I find it so haunting and why it helped inspire this thread.

As my schedule is vastly uncertain this week, I at least leave this little treasure of an unexpected rediscovery.