It turns out the thin part of this case is already thicker than the camera bump, as the camera bump is only about 2 mm.
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This following picture is taken parallel to the surface of the case to further illustrate that the case is thicker than the camera bump. (The elevated area is the added corner bumper protection on this case but obviously you can get cases without this if you don’t want it.)
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BTW, as you can see, there is a grid of dots on the inside of the case. Each dot represents a slight bump on the inside surface of the case. What this does is keep the inside surface from touching the back of the iPad (except at the dots). This makes it look better, because when plastic touches the metal, it can look odd if it doesn't consistently touch along the entire surface. The dots make it so none of the back is touching so the back look is consistent.
The case also has a cutout to allow for attaching a Smart Keyboard. Also, the cutout for the Lightning port is oversized to accommodate oversized third party Lightning connectors. The same goes for the cutout for the headphone jack.
All this for less than US$10.