Ghost content—stale pages hidden in archives or search caches—can silently drag...
https://www.list-bookmarks.win/when-legacy-pages-suddenly-reappear-in-search-results-it-usually-points-to
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