Their system uses some custom adhesive as do some of the other systems around. The catch is how will this adhesive hold up in 30 years and are you brave enough to be that it works well on your house compared to the saving of using conventional systems? This is why innovation in building is slow. Fail fast is not possible. And there are often side effects. Just ask people with a metal framed house that creaks when it…
Australia has extremely strict building regulations, codes and inspections. (My brother just built his own house there...) I feel extremely confident this has been tested thoroughly, and it would not be allowed if it has not passed all tests.
Most building methods that are not known to fail catastrophically are allowed. (Including among others fires, water handling, short term structural collapse and invalid administration as well as cheating on plan vs implementation.)
So it is mostly bureaucracy.