Lower noise or not?
The only way to categorically prove these new blades are quieter is to perform some kind of noise evaluation testing with a machine with standard blades and one with the Van Horn blades. Maybe that will form part of the test programme at some point. In the section of the video between 0:23 and 0:32, during the sidewards hover, the main blade noise seems to be quieter than you would expect. It certainly sounds "different".
500 Fan.