No, it isn't. The guy is putting on a very effective act. There's no way he's spent 26 years "developing" bulletball. I'm sure he made that up (as well as other details) in order to add emotional appeal to his game. In fact, he's had some real success as a result of his unusual marketing skills:
Griffin has joined forces with the Rehabilitation Institute of Chicago, Veterans with Disabilities, and the Disabled-Athlete Sports Association to stage the first annual “Bulletball Tournament” which will feature the former Ms. Wheelchair America.
The long term prospects for an obviously stupid game aren't good, but still...
