#SEOtip: Google Can sometimes index the URL, if you have both "Noindex " on the page and blocked that URL in Robots.txt. This happens because crawlers won't be able to access the webpage header due to robots.txt, and if crawler is able to find the URL through links from another site ( Backlinks ). Link to the Doc in Comments.
Technically, the URL is already in the index and Google doesn't have a mechanism to crawl it to eventually remove it using the updated. For edge cases, just use the outdated content feature in the Removals tool in GSC to permenantly remove it without the need of a crawl. For new features with URLs you don't want in the index, catch them whilst they are being developed and update the robots.txt ahead of time, before they even exist.
I scale early-stage startups organically | Get Leads that Convert | $1M+ in Client Revenue | Co Founder Urban Awaas
8moDoc: https://developers.google.com/search/docs/crawling-indexing/block-indexing