Yeah, I'm skeptical of that paper and it is extremely difficult to disprove, because access to that population is so restricted.

The way I'd test it would be presenting a set of 2 tones and giving them control over a third. like 200hz +300hz and then letting them move a slider between 325-425hz. Where do they find the resulting sound most pleasant and where most unpleasant?

The sensation of dissonance is so strong and visceral, it is extremely hard to believe it has no universality to it.