Getting rid of old Google results is straightforward if you know where to look....

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 straightforward if you know where to look. If you own the site, use the "Removals" tool in Search Console for urgent wipes