It is NOT a hoax....he was a very brave boy who happened to die at 9:11 on 9/11....people die every minute of every day. The drive to find his blood marrow donor and other articles were well documented in the local papers and on tv. There is even a link on his page to Lance Armstrong's site (which is currently down for maintenance) that has his courageous story.
A very special and brave boy who is out of pain now and in peace.
If you get a moment please go to his site and read his story and see his photos.