I've done a lot more reading about mysto spots than surfing them. Anyways, I saw the clip above a while back, then I saw this thread. The place really isn't a secret, it's in plain view from the bridge like what was mentioned earlier. The secret is more like in what conditions will the place start to work.
That's a nice compliment to the "Drunk" thread going on right now. The guy you see shotgunning a beer bites it on the take off right after that, then there is a picture of him on a knee high wave, and that's all you see of him on a surfboard in the rest of the clip. I guess the moral of the story is don't waste a unique opportunity to surf a mysto wave by shotgunning beers beforehand.