It's Vocaloid. They used software to make the song, same as we've been using software to make music at home for over two and a half decades. Some modern programs for doing this let you tell the software what to sing, and the vocals are made from a voice bank sourced from paid artists who signed up to make the voice bank because they wanted to. It's not fucking. Autogenerated by chatgpt or something.
I'm pointing this out because "ai" means like sixteen different things and these days if you say something is AI everyone assumes it's autogenerated dross created in the least ethical way they can think of. In this case, it just means they made a cool animation and wrote a cool song and happened to use a voice synthesiser for the song.
honestly thank you for this because i had not unmuted, i just thought this was an annotated chess demo that went hard
I just watched this on mute and it's hilarious because without the song there is absolutely no context for why the visuals go that hard