Clearing outdated search results comes down to one question: do you control the...

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

Clearing outdated search results comes down to one question: do you control the site? If you own it, update the page and use the "Refresh Outdated Content" tool in Google Search Console to nudge them to re-crawl