If you need to scrub old search results, your first step is checking who...

https://reportz.io/technology/how-do-i-keep-dead-urls-from-creating-a-bad-user-experience-in-search/

If you need to scrub old search results, your first step is checking who controls the site. If you own it, remove the page and let Google re-crawl it. Use the "Remove Outdated Content" tool if the page is already gone but still showing up