Someone gave one of my kids a dough-based circuit activity once. I recall it was hard to prevent the various globs of dough from touching and we burnt out most of our components within a few minutes. The experience was very poor compared to something like snap circuits, or even just using a bread board.

If the LEDs and whatnot were in modules with polarity protection there might have been something there, but I'm not convinced the dough adds much over just a bag of random components for teaching kids about circuits.