The question is how you calculate or define excess. For one, excess calories aren't 100% stored as fat. We're not that efficient.

Additionally the fatter you are the more calories you use at rest. So there's a point where if you consistently eat too much you'll stop gaining weight.

The biggest source of error here will be the calories in the garbage bin though. I wouldn't be surprised if a lot of this is stored in the waste disposal, not the waist disposal.

If I throw away 500 calories of food, I'm not eating an excess 500 calories. Let's not engage in equivocation