I think I get what the article is saying. There's a perception that women are allowed to use the word "love" casually, whereas men are not. A woman can tell a guy she loves him in ways that say, "I think you're a great friend," or, "I care about you a lot," or, "I wanna have your baby." When I guy says, "I love you," it means, "I have a crossed an invisible commitment line and now consider you to be a suitable long-term mate," whether we're trying to be casual about it or not.