I have just checked, and the terminal that came with KDE has the ability to set a background. I'm sure a couple of other linux terminals do this too. What we see here is either a linux terminal running on an OS X machine via Xfree and/or OroborosX, or a terminal on a linux machine with an OS X theme applied.
So, no, its not a fake. But I'm not losing any sleep trying to put penguins into my terminal window.