This is the PA link to the album referred to....see reviews.
Several PA members have reviewed this Wilson work and said that some of the sounds are reputed to be actual recordings of supernatural sounds, ie, ghosts. It's not said where Wilson accessed these sounds.
Another reviewer said they are merely odd processed sounds from old vinyl that are eerie.
from TCat review:
"There is nothing electronic here, it is all organic sounds, some of them
processed however. Other reviewers here have stated that these are sounds from
recordings of the dead conversing with the living. This is not really true. It
is, however, inspired by the work of Konstantin Raudive who tried to communicate
with the dead and capture the sound on magnetic tape. Notice the key word here
is "inspired". The sounds here are actually processed sounds from old 78
records, processed piano sounds, crackling sounds from old vinyl (which is
pretty common on BC albums), and other atmospheric sounds from drones created
from various sources. As romantic or intriguing as the idea of recordings of
ghosts is, it is not really true. However, the sound is still eerie and
definitely does sound as if it is recordings from beyond..."