Going to their channel coughs up <https://www.youtube.com/watch?v=CUleKnUUaGI> which is labeled as the prequel to that, and it seems[1] their "text2dragonforce" command is likely just there to make the video funny but the content was generated by https://suno.com/

1: https://www.youtube.com/watch?v=CUleKnUUaGI&lc=Ugyty4kLtMj52...