Stale, forgotten content often resurfaces through search engine scraping,...

https://www.social-bookmarkings.win/stumbling-upon-legacy-content-in-search-results-is-a-common-headache-that-hurts

Stale, forgotten content often resurfaces through search engine scraping, hurting your current site’s authority. When outdated pages reappear in search results, they confuse users and dilute your SEO efforts