I could have missed something, but I believe the $6 is per delivery, not per package. One $6 charge to deliver however many bags arrive in that delivery.
We own at BCV and I can't remember Disney ever promising us or advertising free grocery delivery. I don't see current advertising saying as much, and even when I look at room amenities "being able to cook your own food" is not listed. I understand I'm arguing semantics, but Disney charging a fee to deal with grocery deliveries (a fee which you don't have to pay, there are alternatives) does not take away your ability to obtain and cook your own food.
Disney does have their own grocery delivery for DVC members, it is a $10 fee to use it. The list of items is fairly limited and I understand that, but they DO offer the service. The fees in the gift shops are comparable to what some pay from services that deliver. I'm putting together an order for my upcoming trip and a loaf of bread from Disney's gift shop is maybe 50 cents more than the one I'm having delivered.