From the article:
"Libertarians are broadly defined as people who favor less government in both economic and personal issues. They might be summed up as “fiscally conservative, socially liberal” voters."
This is a non-sequitur. If one posits that "socially conservative" means "eager to have the government enact right-wing social controls" (a popular usage, whether or not it's accurate), it does not follow that "socially liberal" means "favoring less government in personal issues." "Socially liberal" in fact means "eager to have the government enact left-wing social controls."
To the contrary, ask a libertarian if they want more laws proscribing what were lawful activities, e.g. tobacco smoking, etc.?