If you put the bottom line up front, the rest of the article doesn't support that conclusion. It doesn't address the resources that we're spending on loneliness, or what's a better use of those resources.
There's another swing and a miss for the conclusion a little earlier too. "If there has been increasing chatter about loneliness, then, it has been more the result of higher expectations and greater self-reflection — especially among the chattering classes — rather than greater isolation."
So people aren't more lonely, they just feel more lonely. But that's not true loneliness. Again, you could write an interesting article on that, but this article isn't.
This article ultimately comes off as a call to inaction because the alternative is believing there's a loneliness epidemic and being tempted to do something about it.