1. it has entered the food supply chain,
2. it then has been removed or discarded from the food supply chain or at the final
3. it is finally destined to be processed as waste.
Therefore, food waste can comprise items which include parts of food intended to be
ingested (edible food) and parts of food not intended to be ingested (inedible food)
Now it becomes clear, when they hit you will terrible headlines about 2kg of food wasted per household per day, they are including those orange peels, the chicken bones, the avocado stones, the grapes stalks...
It also explains why food left in fields or discarded for being imperfect isn't counted as it's not entered the food supply chain yet.
So my conclusion is that households waste a fraction of the reported amount, but overall the wastage is probably just the same as so much bulk waste isn't counted at all.