It means it is intended to evoke something approaching the feelings and mindspace associated with dementia. We have works of art that allude to or generate all

It means it is intended to evoke something approaching the feelings and mindspace associated with dementia. We have works of art that allude to or generate all sorts of human feelings. While perhaps "the real deal" would be a piece of music written by someone who was actually going through the ordeal themselves it absolutely reminds me of collections of paintings or books created by artists with progressing dementia. As someone who lost a family member to it, I couldn't stand to listen to much of the album because it is just too on the dot.