Do the silhouettes actually move? I stopped watching about 30 seconds in when I realized that it was just painfully unfunny.

I don't think so, but I couldn't bring myself to watch the entire thing. Between their audio problems and the fact that I don't think they actually told any jokes, it's really about as riveting as watching an overland race between a brick and another brick.

Its like they're afraid to say anything bad about the show, even to make a joke. Are they afraid of being assaulted by pissed off bronies?

One of them sounds female. That could be an audio trick, but it's possible.

There's, unsurprisingly, another one of these on the related videos. It features two dudes that actually move. Based off the three minutes I spent skipping around, their commentary is unfunny meme references and 3dgy jokes.