Last minute changes to the content become a bit of a nuisance when the deliverable involves a voice recording, to say the least. A good synthesis pipeline could be set up to re-render the whole thing on a git hook.

a guess: cheaper to produce than other videos & favorably ranked (& chosen by consumers) in search results (vs only text)?

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This happened in a demo at work recently. I couldn't follow along, the robot voice was just too distracting.

In that case I think it was someone insecure in their English skills, which I guess I can understand. I would rather they just do their best and we will make it work. Most of my coworkers are ESL anyway.

If it's really a problem just ask someone else to do the voiceover. The robots are not anywhere close to good enough to do the narration without being incredibly distracting.