good information though the tone is a bit of a scare tactic.
anyone using local wallets on their computers should be aware of best practices for security. the most basic piece of info to know is if you have a coin wallet on your computer with a balance above zero there exists on your harddrive a string of numbers and letters that can spend your coins. there is lots of vectors for attacks. i dont think exchanges are bulletproof we've all seen them go up in flames, but its just as often a harddrive explodes or malicious entity gains access too. if you share your computer with people and you have ever opened up a brower to see crazy ass toolbars installed or they are trigger happy with downloads, clicking popups, or facebook apps, and allow permission to anything clicbait related... that computer is probably not a good place to store value.. if you do any of those things, you might want to think about having a clean computer for coins, or keeping them on an exchange or setting up cold wallets. there is lot of information out there for protecting your coins. and some extremely scary examples generally followed by recommendations to "not do whatever the hell you did ever again" if you expect the outcome to be the same.