The author has stated it's AI in their YouTube video descriptions [1] [2], e.g.

> Disclaimer: I do not own the rights to the original song's lyrics or melody. This is an Al-generated cover intended for entertainment and homage. The original composition, lyrics, and music are the sole property of the original artists, writers, and copyright holders.

It has gone viral in last few days, due to TikTok and YouTube Shorts.

10,000,000 listens on Spotify - https://open.spotify.com/track/0HI7kOxEfnSMD2Z27BJnJN

There's various other YouTube videos of it with millions of views.

I heard of it myself through YouTube shorts, and after a few listens suspected it was AI.

[1] https://www.youtube.com/watch?v=OWHpljeJv34

[2] https://www.youtube.com/watch?v=bQ8GbwQV5zE