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

https://smoothdecorator.com/i-noindexed-the-page-but-google-keeps-crawling-it-is-that-normal/

If you need to hide pages from search results, use the right tool for the job. Add a "noindex" tag to the page header to tell Google to drop it from their index. If the content is already gone, return a 404 or 410 status code