The article you linked says the opposite of what you quote.
Right after the quote, the article's authors say that these claims [about Europe being economically interdependent before WW1] are exaggerated and this do not disprove the theory that interdependence prevents war.
Right after the quote, the article's authors say that these claims [about Europe being economically interdependent before WW1] are exaggerated and this do not disprove the theory that interdependence prevents war.