I don't have any credential/experience other than being a long-time user of fitday. When you pointed out the various graphs provided, I recognized them as reports produced here. The only way you can obtain a chart of nutritional information for one food is to isolate that food in your food log. The charts/reports are derived from food logs. I would skip ahead a day to an empty food log to attempt to isolate one food.
I'm no authority on how the charts are constructed. But I think that if you look at the charts as a user (yourself), you will see how this person produced the charts for the various foods. Look at fitday classic and fitday 2.0 both. I think he was using fitday classic.