PLEASE Read my links
There IS an NABM - and it is part of the larger NFB - and they do have a very REAL organization - with very real people - who do wonderful things.
If you had read the link above - AT THE TOP - Before the List of resources:
"The ability to read and write music...
A blind student needs to have that ability just as much as his sighted peers."
David Goldstein, Director
National Resource Center for Blind Musicians
If you had read the link above - IN THE MIDDLE -
National Federation of the Blind Musicians Listserv
I believe there will be clarity soon.