I finally got around to pulling the sticker on the replacement bed and checked the aluminum plate. The plate is flat. I dunno how off the sticker is or if the sticker is sitting up on the plastic. Now that said with my engineering ruler against it, I can easily deform the hole assembly by the amount we are worried about. It isn’t that stiff. I know people said the aluminum plate is hard to deflect, it is not. I can easily deflect it a mm with 2 fingers.
Edit: When I decouple the steel bracket from the bottom, the aluminum plate/plastic housing are still dead flat together. So at least in my case its something with the sticker or sticker and plastic housing edges.