Ghost content—stale pages hidden in archives or search caches—can silently drag...

https://wiki-site.win/index.php/Why_Do_Old_Content_Problems_Show_Up_at_the_Worst_Possible_Time%3F

Ghost content—stale pages hidden in archives or search caches—can silently drag down your site’s authority and confuse users. If old, irrelevant material is still surfacing, it’s time for a surgical audit