I've not yet read the full paper, but the abstract seems to say that "16 people with good hearing have good hearing".
They don't seem to have bothered with a control group, which makes me worry about the rest of their methodology ... the first paragraph of their procedure (2.3) suggests they have zero idea of what a random double blind test is, or if they do, they wouldn't bother with it in this experiment.
I just spotted this little gem "At this individual level, three expert listeners out of 16 obtained significant results ... However, they significantly selected the wrong answer " ... so we will just ignore those results.
Oh deary me ...