This is incredibly negative. You could make the same comment about any public form of communication. Speeches, articles, heck even a Twitter post.
This is an absolutely destructive viewpoint in particular for all those brilliant people who do interesting stuff but never think they are ready to share their story just because they are no Jimmy Fallon. Being bad at things in the beginning is part of every journey.
That was my initial reaction as well. Basically, never be a first-time speaker because you might not be perfect, at which point you might as well get out of the field.
I'm sure I'd cringe to see early talks I gave at events. (To say nothing of more recent ones that just didn't come together as I intended. Or, heck, even IMO good ones that aren't as good as awesome speakers give.)
This is an absolutely destructive viewpoint in particular for all those brilliant people who do interesting stuff but never think they are ready to share their story just because they are no Jimmy Fallon. Being bad at things in the beginning is part of every journey.