It's surprising that a content creator would put this much work into a video and then use an AI narration.
But some people are not great speakers - I can imagine using AI narration if you don't feel like your own speech will meet your own standards.
It feels like making "Where the tokens land was checked against the table published in Scientific American in 1996 (Illinois Avenue: 3.18% published, 3.19% in my simulation)." a key point of the investigation doesn't see like a human choice