You're probably correct when you say that there is more "on plate" waste in the MDR than in the OVC, but there is also the "serving tray" waste in the OVC that needs to be considered. With a similar selection at dinner to that offered at lunch but with fewer customers, there is probably a lot of food wasted that doesn't make it to the plate, either due to end of service or exceeding the safe time for a display to be on display at serving temperature.
Despite my comments above, if I had decided to visit the OVC on the evening of the video in post 1, I would have struggled to find something that I really wanted to eat. They need to roll back on the changes a bit (or quite a bit). Cook to order grill is probably something that has the least waste.