aren't blind people more susceptible to auditory stimulus? wouldn't that skew the numbers?

/s

The article states it is sound frequencies “not normally measured”. It doesn’t say “can’t be”, so the first step is an objective measurement

Of course it goes further to point out that some things can only be heard/felt by a tiny percentage of people - the hard part is setting the allowed threshold and not perhaps that’s where your blind study idea would be helpful