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

https://numberfields.asu.edu/NumberFields/show_user.php?userid=6593824

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