Google: No Links To A URL? Then We Won't Find It

Google's John Mueller posted a reply on Twitter saying that if there are no links to a specific URL, then Google won't find the URL. Of course, the exception here is the fetch and submit feature and Sitemap feature. But outside of that, Google's John Mueller is saying they GoogleBot won't find a URL without there being links to it.
John wrote "If there are no links, we won't find the URL, robotted or not."
@JohnMu if a URL has been blocked in robots & has not crawled before, no backlinks, cud it still show in SERPs as blockd by robots.txt
@collindaviss If there are no links, we won't find the URL, robotted or not.
There is the context. There have been studies done to see if Google would index URLs from Chrome data and the most recent one said no, Google doesn't use Chrome data to discover new URLs.
In any event, what is an SEO without links? I guess a magician?

Forum discussion at Twitter.

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