I find it odd that some owners are happy to approve the floor boards if the problem owner has installed noise reducing material underneath the floorboards as per Australian Standard requirements.
Who cares what noise reducing material was installed? The question is: could it cause other residents a problem over the projected life of the floor? In the worst case, someone moves in who clip clops around in high heels at 2:00am.
Jimmy’s advice is correct. Get a professional acoustic engineer to test the installation.