[HarHarVeryFunny]

If you read the report OP linked, it says they did a blind test where she was given shirts that had been worn by a variety of people some of who had Parkinsons for differing length of time, and some who had not, and she was able to get them all, including what they though was a false positive until that person came back months later to say they had developed it (similar to how she's been able to smell it on her husband before he was symptomatic).