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I believe it's Eleven Labs API with the Stability setting turned down a little bit. It is definitely trained on human speech and when you use a somewhat lower setting than default, it will insert those types of natural imperfections or pauses and is very realistic.

I would have added umms and hmms artificially just to make the latency less apparent, so Id say good chance thats what they did lol

Now that you mention it, I, uh, also add umms when my speech pathways experience high latency.

I'm not sure when OpenAI added them, but you can hear similar things when using the ChatGPT voice mode on iOS. Sometimes it feels almost like a latency stutter and other times it feels intentionally human.

I use ChatGPT voice a lot, and it is prone to this exact type of stutter. I don’t think it’s intentional. I think there are certain phonetic/tonal linkages that are naturally “weird” (uncommon in the training corpus) and that AI struggle with them. Why this struggle manifests as a very human-like stutter is a fascinating question.