The answer to the title question was never scientifically answered. They described the experiment, the results, and then lead into a conclusion that didn't match the science. Then they finally reverted to anecdotal evidence to support the original claim which the scientific evidence does not support.
The title changes changes “who refuse to help their owners” in the article to “who harms you,” which is a big difference. The study [1] never uses the word “harm” with respect to cats; it does to reference a different study using infants. That specificity with the word should communicate what they tested for.
Anecdotally, I have had a cat and a dog. Both of them reacted, immediately and quite viciously, to people who raised their voice to me. (Growl and barking and hissing.)
[1] http://animalbehaviorandcognition.org/uploads/journals/30/AB...