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

https://wiki-square.win/index.php/Should_I_Update_an_Old_Page_or_Remove_It_Entirely%3F_A_Guide_to_Content_Sanitization

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