Interesting, I hadn't thought about these as possibly being on plan.
So apparently they are made with the starch of the mung bean as their only ingredient. They aren't very high in fiber and are pretty much 100% carbohydrate ... and
according to this, they are low glycemic index and medium glycemic load ... I'm not sure what that means in terms of SBD.
Are Mung Bean Noodles Good For You?
Personally I think they would be fine occasionally but I wouldn't go out of my way to include them. I have found rice noodles made with brown rice that might be a better alternative with almost the same texture in the future. But I haven't tried them yet!