That is correct. I have watched them consume completely a six inch long fish during a night dive. We were watching it with our lights and a sleepy fish wandered by too close. The octopus grabbed it and it disappeared under the mantle of the octopus and was gone. You could tell it was munching on it by the way it moved. Probably took 30 seconds before the fish was consumed and the octopus moved away from us.

That sharp beak they have to eat with could easily take the guys nose off in a few nibbles. If it wanted to. But I doubt we taste all that well to them. Not their normal diet. Kind of like sharks. We are not their preferred food.