After Google processes your Outdated Content removal request, you need to...

https://www.softwaretestingmagazine.com/knowledge/outdated-content-tool-how-to-validate-results-like-a-qa-pro/

After Google processes your Outdated Content removal request, you need to verify the fix beyond a simple search. Use incognito mode to bypass personalization and check the cached view to ensure the snippet is actually purged