The article describes how a thief can possible hack accounts in a trading platform. And yes, its really possible for someone to steal you money in an exchange that's why its not safe to put all your funds in their. The best thing to do is not really put all your life savings in an exchange but just leave something there for your day trading purpose only. So that in a likelihood of a hack they can only take a small portion of your funds. Used a strong password, and change it frequently, 2FA I believed is not a strong as it used to be in the beginning, but it is good to still enabled them.