I've just had a look at the pew study the article are based on and the original article in psychology today is pretty lazy, the pew study notes a rise in both sexes of being unpartnered. The article ignores this and instead focuses on men, noting that men make up the bulk of dating apps and sites (nothing new), men are typically happier in a relationship (nothing new), ignores previous studies that show men have always been happier later in life when compared to women or how women in general are unhappier than they were 40/50 years ago.
Seems to me that the psychologist in question had a piece about 'lonely, single men' before hand and used the pew study to fill in the blanks so to speak. Hell, the cynic in me would question if its been written to counter the rise of the '30+, lonely, single cat ladies' that are peppered everywhere across social media.