Good call!
Naturally, the prophet of the absolute, ultimate hypertext system puts out his ideas without even using ordinary text. We can assume that in Nelson's world, the system would transcribe and add to his words without him making the effort. (Edit: Despite the fact that Nelson is periodically looking off screen, there's reason to think he's reading from a prepared text. He quite possibly is reading from bullet points that he is used translating into statements - something I think many experienced public speakers do).
Nelson is a fascinating character for his idealism concerning what computer interfaces should do.
It's easy to see how that idealism might be serving as screen hiding the inherent barriers to such a system ever existing - especially, as technology allows one to give data more structures and inter-relations, there's actually no guarantee that the tools for dealing with those structures will keep with their complexity.