> He spoke like a man who didn't know how to speak in public, not like someone who was ignorant or addled.

His problem went beyond not knowing how to speak in public, which, by itself, is not a sign of not being intelligent. He was truly very dull, something he himself admitted to ("I'm not the sharpest tool in the shed").

Aside from that, if you passed through college, then through grad school and always referred to the Internet as "the internets", and to "the google", then public speaking is the least of your worries.