Yes, if someone has physical access to an unlocked iphone or mac you're screwed. The author's idea might rather be about the OS, the main difference between an

Yes, if someone has physical access to an unlocked iphone or mac you're screwed. The author's idea might rather be about the OS, the main difference between an iphone and a mac (or pc for that matter) is the os. Hence the recommandation for a chromebook. I suppose the author assumes that on ios a random website is less likely to have access to your files (articles). So this might be more about protection from attackers who don't have physical access to the device.