It was turned into a community project after the original developer stepped down. There are more details in the readme: https://github.com/tt-rss/tt-rss#some-notes-about-this-project

SimpleFIN, I currently use it and it works well

The actual wording is “Music and audio that is generated wholly or in substantial part by AI is not permitted on Bandcamp.”

So no, 99% AI is also not allowed