That was me

And, the 2021 model will also be flat 1mm thicker, but in other ways likely structurally similar to the 2020 iPad Pro. (It will still flex more than the curved sided iPad Pro)
The reports are that it’s thicker by 1mm which could be due to a larger battery with the shell being just as thin as previously. Also, that doesn’t remove the issue that the bands on the cellular version cut across the sides creating weak points. I hope it ends up being good enough for you, but no one is going to be able to tell you, before the purchase, that the way YOU expect to use it, it won’t bend.