A single solid element across a wall thickness does not provide a sufficient number of nodes to capture gradients through the wall thickness. That is the point of this meshing tip.
When you say "thin part mesh" do you mean a shell mesh? Shell elements are very good at capturing bending of thin structures and would be an alternative to this solid element model, however, there is work to be done in a geometry editor to create the sheet body to replace the solid body.
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