Advertising is for the people doing the buying. So until your dog gets a credit card, they will advertise to what sounds good to the owner.
Of course, thinking of offal as horrible to eat is a modern western concept...and really a fairly recent one at that. If your great grandpa is still kicking around, there's a good chance he will wax nostalgic about kidney pie, chitlins or similar innards based foods.
We had two of our nieces in Thailand last December. I brought back several dishes to the table to share. They devoured one of the dishes that I thought was mostly for me...only after they finished did I tell them it was stewed pig intestines. For minute they were horrified thinking it was pork flavored noodles and then they shrugged and decided it was fine.
Go watch a wildlife film some time...what's the first thing a pack of wolves go after, the soft inner bits. That isn't a mistake. It's what is good for them and they are genetically programed to prefer it.
PS: You do realize, Oats are not a normal food for a dogs. The are moderately omnivorous (though preferring a carnivore diet) in no natural situation would they be eating cooked oats.