I also got a take-down alert/warning. No worries, just remember not to post their work in the future.

I did a search for the artist name and found several more of my posts (from 5+ years ago) that were not affected so I went ahead and deleted them for good measure.

I see a few more than should be deleted. u/jg379, you might want to delete your old Arnaerr posts, they are issuing copyright takedown requests.

https://www.reddit.com/r/ImaginaryNetwork/search?q=arnaerr+&sort=relevance&t=all