Their graphs are from 20kHz to 160kHz (at a quick skim), so this doesn’t appear to be an immediately useful breakthrough. Some graphs show the scales are mostly tuned to a frequency, not wideband, so even more limited. Very cool science though.
There are aspects of it that should scale, but it's not as simple as "multiply up with the wavelength". They mention that the layer of air is significant, and that makes me think the Reynolds number comes into it. My guess is that the high viscosity of air at the scale of the scales makes it a fairly effective medium for getting rid of the energy as the scales vibrate. If you just make bigger scales the air appears correspondingly thinner, so there's less viscosity, so the scales wouldn't be damped as quickly. You'd want some other sort of damping mechanism to dump the kinetic energy into heat. But other than that, the main challenge is getting the scales to have the right harmonic characteristics, which is just a matter of shape and stiffness.
Their graphs are from 20kHz to 160kHz (at a quick skim), so this doesn’t appear to be an immediately useful breakthrough. Some graphs show the scales are mostly tuned to a frequency, not wideband, so even more limited. Very cool science though.