It seems to have been at least slightly improved, but youtube video summaries suffered from this to an almost comical degree not long ago. The AI voice is already pretty recognizable and stilted, then you constrain it to avoid saying anything negative or spoilery about the video, and (presumably) don't let it remember past output. No surprise its extremely repetitive. For humans you're at least getting different people's voices, on different days, who remember that they just wrote about how the last one was a "unique look highlighting the importance of design".