Gas Recirculation Valve (egr Valve) problems of the 2010 Land Rover Range Rover Sport

My wife brought in our 2010 Land Rover/range rover sport: supercharged. It was not able to move. We were informed by mainline that the diagnosis is as follows: the engine seized due to no coolant being in the engine. We always had the vehicle maintenanced at mainline Land Rover since our acquisition of the same. There was never any indication that the vehicle was malfunctioning or about to malfunction (I. E. Smoke, odor, electronic display/indicator, residue of coolant, leak, or change in operability). This failure of the vehicle to move happened in an instant and without warning or prior indication. We have consulted several certified mechanics and automotive specialists including a certified mechanic with a college degree in automotive science who works for another luxury vehicle retailer. All of the automotive professional, unanimously conclude, that this diagnosis is impossible. They have considered all scenarios.