Cleaning up outdated Google results depends entirely on whether you control the...

https://tango-wiki.win/index.php/How_Do_I_Fix_a_Soft_404_That_Keeps_a_URL_Indexed%3F

Cleaning up outdated Google results depends entirely on whether you control the website. If you own the site, delete the content and ensure it returns a proper 404 error code—avoid "soft 404s" where the page still technically exists