Getting rid of RSS subdomain

Hello! I had an RSS app (tiny tiny RSS probably) on my domain but I haven’t used it for many years. I was going through cPanel and cleaning things up, and uninstalled the app from “my apps.”

Now, I still have a folder in my cPanel file manager called RSS, and it has a file that is recording errors like all the time. Screen shot of the RSS folder below.

Should I delete the folder/files? I don’t want to keep generating errors. And this URL for my earlier RSS feed gives fatal errors now. Would rather not have this as a subdomain anymore and not sure how to delete it!

Okay I found a way to delete the subdomain at least. I went to cPanel, then Domains, and got to a screen to delete the subdomain. But it says it won’t delete the files in my root. Should I delete those too if I’m not using this at all?

As I said, it includes an “error_log” doc that is seemingly updating frequently (every day?) with errors, and that seems like unnecessary work for something I’m not using at all.