...listeners judge the female speakers with vocal fry as sounding "untrustworthy", there is a good possibility that they are simply making such a judgment based on the speaker not sounding like herself. The better lesson that one might take home instead here is that one's job prospects are harmed if you try to talk (or act) like someone who you are not.Read the full take-down here (including bonus spectrogram!)
PS: I knew Christian briefly when he was an undergrad at SUNY Buffalo. He was talented and motivated. Now he's slumming it at some shady, slacker *university* in Connecticut. Damn waste.