To be fair, I'm pretty sure that place isn't really a DIY that's on public land or open to just anyone. I think it's more of a privately owned skatepark that does skate lessons and stuff like that.
I always appreciate all the intricate details that they include in these videos, even though I really have no idea what he's talking about most of the time. It makes me feel like one day, I too can get ahold of a bunch of concrete and make one of these things lol