Grapplers, you're just going to have to file this one in the "Should I and/or Do I Really Care?" file. It's a choice you're going to have to make for yourself, after some deep contemplative thought. Do I really care to watch a 3 minute video of Marcelo Garcia, arguably one of the best (if not the best) submission grapplers to ever compete with or without a gi, tooling around with his students at skate park? Does that say something about me as a person? If so, what? When you arrive at the answer, I'm sure it will be profound and you'll be a better person for it.
Now, in the meantime, watch the video and waste a few minutes you won't get back ... ever. Still, we're pretty certain you'll minimally be mildly entertained.
Side note: I'm no expert, but it appears Marcelo is a bit tentative on his skateboard. At the same time, he's showing some basic, staying on the board-type skills. You'd know better than I. I'm just a simple grappler with no skating skills to speak of.