Or this is what investigative journalism is all about, you suspect something bad or illegal is going on, so you go undercover to try to collect the evidences? J

Or this is what investigative journalism is all about, you suspect something bad or illegal is going on, so you go undercover to try to collect the evidences? Journalists don't stumble on evidences of misconduct by accident, they usually already have an idea about the story that they wish to write, so they investigate in that direction. Her direction seems to be investigating the shitty treatment of employees by Amazon, so she's wrote a series of articles on that subject and got a job so that she could write this one. As long as evidences presented are solid I don't see how this affects the authenticity of her stories? Especially since she's hardly lonely in this, tones of people are writing and complaining about the same kind of problems with Amazon...