It's non slip like all the other windsurf boards. The Sup surface can't work for windsurf and get very slippery quickly.
I would strongly disagree. If the EVA area is in the correct place there's no need to stand on the other areas, thus no need for a non slip surface. Most windsup and SUP boards are configured this way. It's much more user friendly but it requires a more precise finish on the board because the non slip finish covers up many imperfections. I think having the rough non slip surface on this board is a mistake.