Getting rid of old Google results is simpler than it sounds, but it depends on...

https://lukasnpyy234.cavandoragh.org/how-to-clean-up-old-listings-after-a-site-migration-the-ultimate-cleanup-guide

Getting rid of old Google results is simpler than it sounds, but it depends on who owns the site. If you control the page, delete the content and let it 404 naturally. If you don't, use Google’s "Refresh Outdated Content" tool