Where do you start? First of all, by using a flush system that mixes water with the poop and urine. I have written about how the flush toilet evolved, it was an accident of history. Almost all of this toilet’s technology is about cleaning and reusing that water; the poop is treated through anaerobic processes not much different than a traditional septic tank. By adding water you lose the valuable urine and you create a need to dry the poop. This toilet isn’t dealing with waste, it is dealing with the medium that is moving the waste, the flushing water.
Also, it is hugely complicated. The idea that this could be maintained and operated in some of the poorest countries in the world is a serious stretch. Oh, and it generates deadly chlorine gas. It would need an engineer to run.