Brian, this is epic! What an outstanding song that was well constructed, orchestrated, and mix.

The use of Suno is the red flag for some. However you did use BiaB RTs in your song: "The guitars 650 and 1000 (simple power chords) play in the first and last choruses, but of course they are barely audible alongside all the other instruments. Guitar 4213 is the short guitar solo at around 5:06 (the solo was originally way longer, but it distracted from the "dying" vocals, so it was drastically shortened)."

IMHO that is no different than me using a track or two in a song while everything else is MIDI: I know I play me parts but that is not what this is about, it is about using only one or some BiaB RTS/RDs/ MIDI. Some only use a drum track, as I also have done. Thus since you did use BiaB in your song it is a legal post.

I'm no longer allowed to go caroling at the psych hospital.
I guess Do You Hear What I Hear was a bad song choice!

64 bit Win 10 Pro, the latest BiaB/RB, Roland Octa-Capture audio interface, a ton of software/hardware