Stale content often reappears in search results via legacy cache files or...

https://foxtrot-wiki.win/index.php/What_Does_%22Thin_Topic_Hub%22_Mean_and_Why_Should_I_Care%3F

Stale content often reappears in search results via legacy cache files or outdated archives, potentially confusing your users and diluting your authority. If you’re seeing ghost pages pop up, it’s time to perform a comprehensive content audit