Actually that command seems accurate, because the instructions is to do the reverse of what you googled - it's telling people "how to make an image from a disk device", but in this case the image file has the ".iso" file extension.

But I agree about "copy paste instructions". I remember an intern at work asking me how to switch between virtual terminals on Linux, I told her Ctrl-Alt-Fx, I wanted to explain what virtual terminals are and how the shortcuts are probably configurable, but at that point she already stopped listening...