This really does lead to many questions. For example, are Deaf people really capable of understanding and feeling the true meaning of music? Or is it like trying to teach a fish how to walk? (ergo: it's impossible?)
Another question to consider is how can we prove that Deaf people will experience the same sensations as a Hearing person might while listening to music? Or is it synthetic like in the example of cochlear implants... We already know it is not the same as a Hearing person.
Overall, this seems like an interesting experiment, as the creator states, to allow the Deaf community to experience a "different sense".