I have asked Intellectual Tortoise to ask the author as another person is also recording the song. I'm waiting on the response. If you are a member of U2.com you can pm Intellectual Tortoise.
It is feeling a bit like the author wants to remain anonymous.
Intellectual Tortoise posted the song first on U2.com and has since posted more songs so I'm presuming he/she is genuine when stating the lyrics are from a friend.