If you need to hide pages from Google, use the right tool for the job. Add a...

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

If you need to hide pages from Google, use the right tool for the job. Add a "noindex" meta tag to tell crawlers to drop the page from results. If the content is gone forever, return a 404 or 410 status code