The article does not claim this nor support the claim. It merely says that loneliness is associated with being "weird". No causality.
It's possible to reverse this and infer the more mainstream your thoughts of these celebrities, the more popular you are / will be.
Well, exactly. Parents poster is pointing out that the cause is ambiguous. Actually, technically, they are attributing causality to the opposite direction, but in practice, I'd say it gets the point across.
My intuition is that it goes both ways and it's a feedback loop/downward spiral.
Yes, a social feedback loop, but the internal feedback loop is what causes the downward spiral
Indeed, but the article does not mention causality at all.