That's not really what this article finds... the title is "Loneliness corresponds with neural representations and language use that deviate from shared cultural perceptions", but even that title is too general when it's only talking about a handful of pop-culture celebrities.
And also, remember when a researcher says "loneliness" they mean "self-reported loneliness," I know a lot of people with very little companionship who might insist they are a 0 out of 10 on the loneliness scale.
There's so many different ways to interpret this data:
Perhaps people who are willing to admit they are lonely (usually something that's very mildly frowned upon in my experience) are more willing to break with social norms. Or perhaps having wild takes on reality results in you becoming lonelier. Or perhaps a few outlier individuals really pushed the average. Or perhaps people who are less lonely are generally more knowledgeable/well-informed about these individuals. Etc etc.