If you need to hide pages from search results, use the right tool for the job....

https://blast-wiki.win/index.php/Good_Signs_a_Deindexing_Specialist_Actually_Knows_What_They%E2%80%99re_Doing

If you need to hide pages from search results, use the right tool for the job. Add a noindex tag to the page header for a clean, permanent removal from Google’s index