Europe does not have earth quakes, tornadoes or hurricanes.
With no real steal reinforcement, it won't hold up to even moderate ones of the above. I also have really serious concerns about bond between the layers. If everything is perfect it should not be an issue. But what happens when you have a delay between layers. Rather thats traffic, rejected load of mix, equipment failure. Cold joints can be handled easily with conventional methods, only they are using exotic ( and expensive mixes) stuff to make it work. I also have to question the green aspect of the process as they are using lots of acrylic polymers in the mix to reduce the water content. Which are not green, both in thier production and when they evaporate.
It really is a wiz bang boom type of construction, that needs either a drastic improvement or will be forgotten.