I found a youtube tutorial voiceover made by AI, and I'm blown away by its quality. Can you help me figure out which tool did the author use?

Here's the video in question:

https://youtube.com/watch?v=f4s1h2YETNY

In description they say that the voiceover was generated by AI. I would never have been able to tell that it's not a real person (granted, English isn't my first language).

Could you please help me find a tool that can produce AI voiceovers that are this good? It would enable me to create youtube tutorials despite my accent.

artificial author english found generated person quality tool tutorial video voiceover youtube