Hi!
https://morto.bandcamp.com/album/morto

Also wondering why this is blacklisted

Hello! most likely blacklisted due to the single released in July 2021. Although he is metal, he is not enough to be accepted into the base. Modders don't always blacklist such groups. They only blacklist when different people try to register a group more than a few times, and automatically blacklist it so that different users don't subsequently bother the moderators by putting that group on the queue again and again.
Well, this is my personal logic.

I also found this band earlier today & had posted it here for appeal. Wondering why this was in the Black-list in the first place?

It's a different band that is on the blacklist. Go ahead, Alex Hellhammer.

Thank you EpicDismemberment! You are the best.