Zed is a master of subtle provocation (and not-so-subtle, if you are familiar with his other projects). I suspect that he doesn't actually think that it's easier to become a real designer than it is to be a programmer. But there's a certain amount of truth to the idea that one could pick up Photoshop, or a wireframing tool, or a bit of HTML and CSS, and start turning their ideas into designs much faster than one could learn enough programming to build a full application prototype. Working that insinuation into the title attracts readers.