Presumably this person developed hacking skills as a result of working at Amazon or was hired by Amazon as a consequence of possessing such skills. Surely you don't believe that working at Target makes a person more likely to commit assault?
I'm insinuating, if anything, that the skills needed to be an effective hacker and those needed to be an effective Amazon programmer likely overlap, that's all.
That being said, I agree with you that the person who put Amazon in the headline was trying to discredit Amazon, just like the person who mentioned that Jeff Bezos ate baby whale was trying to discredit him.