Legacy content often resurfaces through search engine caching, confusing...

https://tango-wiki.win/index.php/How_to_Handle_Content_Syndication_Copies_That_Just_Won%E2%80%99t_Die

Legacy content often resurfaces through search engine caching, confusing visitors and hurting your authority. If your site is cluttered with outdated pages, it’s time to perform a comprehensive content audit