It doesn’t seem plausible. After wiping your hands dry the bacteria either stayed on your hands or were transferred to the paper towel. I can’t see a path to the air.

Blasting your hands with air fast enough to blow off whole water drops and shatter them would put bacteria in the air.

I presume that when testing their air driers they use a sterile room and thoroughly washed hands in hospital type soap so any bacteria went down the drain and only sterile water was blown into the air