I think you are being too harsh on him, and the intent of the video.
He's trying to explain as to what these "extra dimensions" are, and what brought it about. These are stuff that a lot of people, especially laymen, have asked. So he's telling them what they are (and what they are not), and why there are theories that employ such a concept to explain why gravity is weak.
In other words, I see this video as a response to the frequent questions that I've seen, especially online, on these extra dimensions and gravity. It certainly isn't out to sell the concept to anyone.
Zz.
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