It took me a while to figure out that the nice product shots of Mac computers were actually live, interactive copies of the relevant operating system, running under emulation. Even the laptops with the screen at a weird angle from the camera. And the emulator tracks whether you've done the things mentioned in the article, like open a particular control panel or tried a particular menu option. This is amazing .
There are even Easter Eggs and additional tasks. If you click on the system description button for each emulator it will give you a list. I couldn't get the later emulators to work correctly though. My mouse kept flying off to the right of the screen for some reason. Also unfortunate is the scaling and tilting effect makes the screens look real bad on my machine. Just ugly aliasing artifacts everywhere.
I agree it would be nice to have an "untransformed" view of the screen; I suspect the site might have been designed with the expectation of a high-DPI screen.