The Washington Post really has lost a lot of credibility since the Bezos purchase in 2013. It reflects a trend of consolidation of corporate media in the hands of America's ruling oligarchs (who exert far more influence over federal policies and expenditures than any Congressperson, and perhaps the President as well).
For example, I can't imagine the WaPo taking this same tone with regard to a Bezos acquisition or contract, or publishing confidential leaked details of inside business discussion, as it would almost certainly upset their owner and lead to 'a change in leadership' at the Post. The same is true of their coverage of the unionization effort at Amazon warehouses and distribution centers. Similarly, the CIA and NSA deals that AWS has engaged in aren't getting this level of scrutiny from the Post either, and there's little chance of the Post ever printing anything [like the 2010] "Top Secret America" series on how defense contracts are doled out to intelligence contractors.