Call it BE if you want (DL calls it domestic F when I try to book it), but you made it sound like it was generally true for DL BE flights, when in fact it's the exception on a single DL BE flight.
DL calls it BE when you are booking it as award (higher mileage required than domestic F), but F when you are booking it revenue. Seems that DL can't make up it's mind as for what this flight really is - they want to have it both ways: charge more for BE, yet provide less service (in terms of food) as domestic F, even though it's a good ~11 hours long flight.
Also DL BE flights are full of exceptions in general. As another example, slippers are only provided on a few BE flights and not provided on others (so bring your own, as what is true on one BE flight is not true on another service-level wise).