I think the reason many lenders do not want to do DELRAP approvals are because the verification of such items fall on HUD, not the lender on HUD approved projects. Yes, a falsified warranty submission to HUD can have a similar liability but I think most lenders would like to move most liability away from their plate. The "30 years in jail and or $1 million dollar" liability is enough to scare any underwriter.
Yes, I wish more lenders wouldn't practice such "scared" tactics, but there was a day when the attitude towards lending was the exact opposite and not too long ago. The correct attitude lies somewhere in the middle but we happen to be in the tightening stage.