I think it's a little silly to take an article that's critical of Amazon seriously when the paper is owned by Jeff Bezos. There are plenty of other sources on the topic including the Reuters article above, which is not behind a paywall.
That wasn't the question. The fact is that you felt comfortable asserting a certain tone in the article that you admittedly didn't even read, and then the article didn't even have that tone.
You're moving the goalposts now by just saying you should blanket not accept any WaPo reporting about Amazon. Which is fine. But that wasn't your original claim.