The trouble with this airfield is twofold. Firstly if you fly a purely visual approach with the location of the papi you will not achieve MEHT as you cross the displaced threshold. This is not a great problem as the undershoot is obstacle free but you will still land short of the intended spot. The second is if you were to fly this approach in anger. If you descended to MDA and saw four whites on the papi would you try and achieve the correct papi path or would you ignore it?