Unfortunately, this video does not describe what its description suggests, “How can content be ranked if there aren’t many links to it?”
We all know that Google is going away from using web links as the primary indicator of page strength (or at least they say they are, when that happens, and if, is anybody’s guess). What we don’t know is how they’d rank content without links. This video doesn’t answer that question directly. It does offer some insight on how Google determines page content validity and value.