If I had only seen that video, I would think this was an April Fool's joke. I then read the article and was relieved to hear there is a little more than this. Perhaps I'm just being pessimistic, but I feel like this only raises the bar a little. I would expect checks it does of mouse movements or headers to be spoofable quite quickly after introduction. I think the best measure mentioned is tracking which IPs are bots, but that's still going to have serious shortcomings.

Very cute video. I like the way the mouse pointers scares away the 'nasties'.