Spelling to Communicate is just another form a facilitated communication, an invalid technique that was disproved decades ago but refuses to die.
Facilitated communication is pure pseudoscience that was debunked almost 30 years ago, but it keeps coming back, creating new victims.
Rob Houben, injured by a car crash over two decades ago, was claimed to be conscious but paralyzed rather than in a persistent vegetative state, and the discredited pseudoscience of facilitated communication was claimed to give him a voice. To the lack of surprise of skeptics everywhere, these claims were not true.
Facilitated communication is exploitation supported by false hope and good intentions. Brain-machine interfaces are progressing with agonizing slowness, but offer true potential in actually permitting paralyzed people to communicate and even regain movement.