As I open articles in batch and either randomly or semi-randomly, I don't get to see where an article is coming from until it loads in the browser. But when it does, chances are the article's hidden somewhere, and the search function only finds the article, not its feed (unless you name the feed as its link).
That would be a problem as then if you find an article whose feed you no longer want, you get reminded to remove it, but have no easy way to track it down. Or, tangential to that and the main reason I sought a solution, Mbin feeds if malformed but still recognizable as RSS feeds become the feed for the landing page, meaning spam of a bunch of communities I want nothing with. 💩
And since some versions ago, a solution indeed came for Newsboat, where it added the article-feed function which when used within an opened article, takes you to its source feed, allowing you to get its link and remove it with your text editor of choice. And it can be tied in Newsboat's config to an internal macro or as a menu option.
Worst part was having to compile the program, but nothing out of this world and at least it works fine when not installed to the system (best option since I couldn't make a decent AppImage out of it).