I would just delete the artists/albums in lidarr. But make sure the box to delete local files is NOT ticked in the confirmation box. Then run a full scan again to pick up the files again

If you have a subsonic/navidrome server I can not recommend Tempo highly enough!

https://github.com/CappielloAntonio/tempo

What do you do on that many pi’s that could not be done easier on 1 x86 box?

Thanks for the recommendation! I just nocked out the audio book version of this and loved it! Fast and fun was right. Needed something short after getting through the first 2 king killer trilogy books.