It seems most of the used lift-gate sill-plates had scratches in the same place. I even purchased a NOS that then scratched in the same place.
Concluded that the latch in the lift-gate with too tight to the sill-plate. So... I cut-out around the latch, then covered the sill-plate with flex-carpet; And lined the opening with the same adhesive-back material I put between the bumper and gap.
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