How to delete albums from My Library when you didn't add them?

As a newbie to Roon I’m still trying to discover how things work. I recently purchased a used Streamer/server to get started with Roon. The person I bought it from left a number of his Qobuz albums that he had added before my purchase which when I integrated Qobuz appeared in My Library together with albums I had added. I can delete albums that I added but not the ones he added as the delete from library icon doesn’t function for his albums. How then can I delete the albums I inherited from the seller?

Did he buy the album that shows up? And if so is it physically stored on your setup?

Because as far as I am aware of this shouldn’t be possible if you are using different accounts.

You’ll likely have to delete the files outside of Roon.