How did Hawking still manage to talk even after he lost his voices

Stephen Hawking talked through ‘the computer’, using a speech-generating device (SGD) or a voice output communication aid. This is a special device that either supplements or replaces speech/writing.

Explanation:

"throngs rushed to the coastal area near the airport from which the plane had taken off, overloaded with relief supplies clemente wanted to make sure reached the victims of an earthquake in nicaragua."