Faking a menu, even in video, isn't the hardest thing in the world.
Faking Smash U's menu, however, is pretty difficult.
They got lots of little details right, details I never noticed until looking at the video (and my own recorded footage) frame-by-frame. It would have been easier to make a fake that doesn't show the CSS, because the CSS isn't easy to fake on video. That moving background image, for example, is stupid hard to get working in a fake roster with additions to it..
It can be done, sure. No one, anywhere, would do it for an anonymous fake, but it can be done.