here is one instance. This is not a hard claim to back up by any means.
https://www.entrepreneur.com/article/237326
http://www.businessinsider.com/ap-amazons-data-driven-approa...
Here they are being called out for being too data driven
http://splinternews.com/the-amazon-way-why-the-data-driven-w...
https://hbr.org/2015/08/data-driven-management-can-also-be-c...
And I hope your day gets better:) We've all been there!!
But the MBAs are not the reason for being data-driven. It's more like the real data analysis goes on behind the scenes (levels 5-7, and more likely on the engineering or research scientist side), eventually bubbling its way up to the MBAs who use the mountains of data and analysis to stroke their egos.
in this thread the person who (claim to have) worked there said otherwise. and in your second link Bezos also said otherwise.
amazon is as data driven as any other fortune 500.
quit fetichising it.