We did something similar, minus the effort to create a video, just lyrics and music (although I did make a lyric video for one of the songs by hand, without AI).
Turned out pretty good, with minor issues in pronunciation, sometimes some excessive repetition and jumping in the lyrics, which I could mostly fix with minor cuts. We will blast the songs in our camp for sure, but a lot of songs are inside jokes, but also a few really good ones (where I actually put some effort into the lyrics).
I do fear that this technology will flood the scene with lots of half-assed bullshit, though.