I really doubt that, because any journalist with integrity would quit and make a stink about it, which would tank the Post's reputation. I would cancel my subscription the same day, and I imagine so would a lot of other people.
Also, I've seen plenty of negative stories about Amazon in the past months. I remember them because they always have a disclaimer about Bezos owning the post in the article. Here's one from just yesterday: https://www.washingtonpost.com/technology/2019/10/24/amazon-.... Can you point to any specific negative story on Amazon that the Post has noticeably not covered?