The article is describing "The Bend Issue" of which a subcategory is Apple's explanation about 400 micron tolerance. The actual story is bigger, as reported by users. Apple doesn't get to control the story here, the users with bent iPads, and the reporters/bloggers covering that phenomenon, do.
Having it your way, it looks like iPads aren't arriving bent, of which they are.
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What's the alternative, that MacRumors only post Apple-Approved Images™?
This is the original post source that borrowed the image used in the above article:
https://forums.macrumors.com/thread...ot-have-a-case-did-you.2160723/#post-26917783
The poster doesn't understand how his $999+ 12.9" iPad Pro is bent. What is going on? Some arrive bent already (way above 400 micron tolerance) and some are bending quite easily with use (which may or may not be a users fault, depending on your perspective or what you know about that user's handling habits).
Either way the story is bigger than Apple's statements. Apple statement only addresses their standards—it in no way, shape, or form is actually addressing why some iPads are coming in visibly bent, or even the ones bending further in use (you can browse the forums for examples).