He could be legit. I've seen amazing simultaneous chess exhibitions, was one of the losing boards in one of them, and I've read stories of simultaneous blindfold chess exhibitions, so I believe what he did is possible.
On the other hand, according to the Amazing Randi, the most common cheat when blindfolds are involved is a tiny vision avenue. With people attempting to win his challenge it happened over and over and over again.
--Percy