Great speaker, but he needs to learn not to do the powerpoint karaoke. The audience sees the slides, we see the slides, no reason to read them verbatim.
I'm sure he'll learn about principles of effective presentation i.e. "don't read the slides" in due time.
:P
The disability argument doesn't really apply here - what about deaf users, why say anything that's not on the slides? Because that's what the transcript is for. Usability is orthogonal to what I'm saying.