I wouldn't worry about that, just play the first few levels and see if it's something you'd enjoy. It's free, so there is really no reason not to try it. At most you waste half an hour, by that time you should know if it's something you want to continue playing or not.
I did already know programming when I tried the game since I started programming many years before the game came out when I was a little kid, but I still got something out of the game. See it as a 3D code golf game to improve your skills. In the missions for example, outside of the main story campaign of the game, it's basically just that, it gives you programming problems and you try to come up with the most beautiful solution to the problem. That will improve your skills even if you're a veteran programmer, we programmers never stop learning after all.
You can also really think outside of the box in this game. For example, you have winged robots that can shoot, basically fighter jets. You can program them to find and attack aliens. Some people however came up with the idea to just make them hover in the air, never moving from the spot they are flying above, just endlessly spinning around and looking for enemies and firing on them when they approach. So they turned these airplanes into turrets that can defend your base :)