I think you're correct. If you played several samples to the audience, they'd start to recognise more words. Actually, I think she influences the outcome by t

I think you're correct. If you played several samples to the audience, they'd start to recognise more words. Actually, I think she influences the outcome by telling her audience the spoken sentence has been "transformed into gibberish". By doing this she has planted the expectation to not comprehend the sound, since "gibberish" by nature cannot be understood.